On curves and crests with reduced visibility it is prohibited to...
A)Overtake, only.
B)Change direction, only.
C)Overtake and change direction.Correct
On stretches with reduced visibility, such as curves and crests, both manoeuvres are prohibited due to their high danger. To overtake, it is essential to see whether a vehicle is coming in the opposite direction, which is impossible in these circumstances. Similarly, changing direction would expose you to a collision with a vehicle you cannot see.