The Fish in a Certain Population Average 10 Millimeters in Length

Multiple Choice

The fish in a certain population average 10 millimeters in length. Imagine that a population of predatory birds arrives in the area, but they cannot eat fish longer than 15 millimeters. After a decade, if the fish average 14 millimeters in length, what probably happened?

A) The fish and the predator coevolved.
B) There was disruptive selection for fish length.
C) The presence of the predator caused mutations for larger fish to occur.
D) There was stabilizing selection for fish length.
E) The longer fish survived and produced more offspring than shorter fish.