Some Gulls Prey on Surfacing Whales, and the Number of Whales

Multiple Choice

Some gulls prey on surfacing whales, and the number of whales that have lesions from gulls has increased from 2% in the 1970s to 99% by 2011, indicating that

A) the gull population increased.
B) the whale population decreased.
C) a genetic change in gulls led to their preying behavior.
D) preying on whales is a learned behavior in gulls.