Question

Mistakes during which of the following processes can cause mutations?
A. DNA copying
B. Hybridization
C. Inbreeding
D. Selective breeding

Answer 1

Really they could happen at any of those processes but:

Inbreeding refers to accumulation of mutations not a "cause" of it
Selective Breeding can also accumulate but not "cause"
Hybridization results in sterility
That leaves DNA copying which of the 4 is the most reasonable and the place where mutations are likely to occur.

A.