When an electron is displaced in a semiconductor, the hole that's left behind is

A. attracted to the negative terminal of the voltage source.

B. attracted to the anode of the voltage source.

C. considered an impurity in the crystal.

D. incapable of carrying a charge.

(D. is wrong)

answer is A : attracted to the negative terminal of the voltage source

I think, that the "hole"moves as it captures a free electron leaving another hole in a slightly different place. The electron leaving leaves a net + charge, which is attracted to the negative terminal. Because the "hole" behaves as a positive charge it is attracted towards the negative terminal.