Which of the following examples illustrates limited gene flow? A) A flock of geese becomes isolated on an island, and, after many generations, exhibits new traits.
B) A flock of geese enters the territory of another flock and begins breeding with the flock in that territory.
C) A species of geese from the north side of a mountain are unable to interbreed with a species of geese from the south side of the mountain.
D) A small flock of geese enters the territory of another flock and breeds with the flock in that territory. This leads to the two flocks becoming one large flock of geese.