If during overtaking a dangerous situation arises, is it correct for the overtaken vehicle to reduce speed?

A)Yes, it is required to do so.Correct
B)No, because the responsibility lies with the overtaking vehicle.
C)It does not have to reduce speed; only the overtaking vehicle or the one approaching head-on will do so.
If during overtaking a dangerous situation arises, the overtaken vehicle is obliged to reduce speed, unless the overtaking vehicle gives up its intention to overtake, in which case it must facilitate its return to the lane by increasing speed.