Although There Are as Many Starlings in North America as There

Multiple Choice

Although there are as many starlings in North America as there are in Europe, genetic variability in the North American population is reduced relative to that in Europe because

A) there are more environments in Europe.
B) the North American population is derived from a small founder population.
C) there is more gene flow in Europe.
D) there is less mutation in North America.
E) mutation is operating.