The causes that may determine the increase of the oil level in the oil sump may be: the penetration of water (the engine coolant) or fuel into the oil sump.
Frequent driving on unpaved roads or uneven roads does not determine an increase of the oil level in the oil sump.
The failure of the oil pump causes the oil to no longer circulate through the engine; this failure does not determine the increase of the oil level in the lubrication sump.
The correct answer is: B
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