Which Statement Is TRUE

Which statement is TRUE?

A) YACs are more likely than BACs to undergo recombination and rearrangement.
B) YACs and BACs undergo recombination and rearrangement at about the same rate.
C) BACs are more likely than YACs to undergo recombination and rearrangement.
D) It is impossible to state with any certainty whether YACs or BACs are more likely to undergo recombination and rearrangement, because environmental factors play a major role in the probability of one or the other occurring.