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For answer  A 

Road traffic legislation provides that towing must be carried out with a metal bar with a length of at most 4 meters, not 5 meters. Using a bar longer than 4 meters is not permitted, in which case answer A cannot be correct.

For answer  B 

Road traffic legislation provides that a car whose steering mechanism and braking system are functional (NOT defective) may be towed using an approved flexible connection, with a length between 3 and 5 m.

For answer  C 

Road traffic legislation imposes strict rules regarding the type of devices used for towing. Not any type of towing device is permitted. Therefore, answer C cannot be correct.

The correct answer is: B

Recommendations:

Obligations and prohibitions when towing vehicles - Audio-Video Lesson --> Road Traffic Code - Obligations and prohibitions in case of technical failure or when towing vehicles

Regulation** - Article 157

(1) Towing a motor vehicle, agricultural or forestry tractor is done in compliance with the following rules:
a) the drivers of the motor vehicles, agricultural or forestry tractors towing and, respectively, being towed must hold valid driving licenses for the categories to which each of the motor vehicles, agricultural or forestry tractors belongs;
b) the motor vehicle, agricultural or forestry tractor towing must not tow a motor vehicle, agricultural or forestry tractor heavier than its own mass, except when towing is carried out by a motor vehicle, agricultural or forestry tractor specially intended for breakdown recovery;
c) towing must be carried out by means of a metal bar with a length of at most 4 m. The car whose steering mechanism and braking system are not defective may be towed with an approved flexible connection, with a length of 3–5 m. The bar or flexible connection must be fixed to the towing elements with which the motor vehicles are equipped;
d) the driver of the towed motor vehicle, agricultural or forestry tractor is obliged to signal correspondingly to the signals made by the driver of the towing motor vehicle, agricultural or forestry tractor. When the lighting and signalling system does not function, towing it is prohibited at night and in reduced visibility conditions, and during the day it may be towed if on the back side it has applied the inscription "No signalling", as well as the sign "Other dangers".
(2) If towing is carried out by suspending with a crane or supporting on a towing platform the front part of the towed motor vehicle, agricultural or forestry tractor, then no person must be inside it.
(3) Is prohibited the towing of a two-wheeled motor vehicle, with or without sidecar, of the motor vehicle, agricultural or forestry tractor whose steering system does not function or which is not registered nor recorded or when the road is covered with black ice, ice or snow. Is prohibited also the towing of two or more motor vehicles, agricultural or forestry tractors, carts, vehicles which are normally pulled or pushed by hand or agricultural machinery.
(4) By exception from the provisions of paragraph (3), it is permitted to tow a motor vehicle, agricultural or forestry tractor whose steering system does not function only when towing is done by suspending the steering wheels of the towed motor vehicle, agricultural or forestry tractor with a crane or supporting the steering wheels of the towed motor vehicle, agricultural or forestry tractor on a towing platform.
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** Regulation = REGULATION for the application of OUG 195/2002 updated (Road Traffic Code Regulation)