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Question

Read the following scenario and answer the questions below.
Western Canada contains a series of tall mountain ranges that extend south through the United States and far down into Mexico. The largest of these ranges are the Rockies and the Coast Range, but they are all part of the same mountain-building event that occurred many millions of years ago, and they all have similar features. In the southwestern United States, much of the vegetation on these mountaintops is alpine, or very similar to the vegetation of the mountains in Western Canada, and they are often referred to as "Sky Islands" because of their similarity to each other, their higher moisture content, and their isolation from the lower, drier, areas surrounding them.
There are groups of tropical birds, such as trogons and parrots, that are usually considered to live in Central America and the mountains of southern and central Mexico. Small populations of these birds migrate into the United States each year. It is probably true that ________.
A) more of these birds are found in the mountains of New Mexico and Arizona than in the mountains of Colorado or Canada
B) more of these birds are found in the taller mountains of Canada than in the shorter mountains in southern Arizona, even if the relative area of the mountains is the same
C) these birds can live in the lower, drier elevations in Canada as well as in the mountain ranges
D) these birds migrate to southern Vancouver Island in the winter because it is warmer there
E) these birds have higher genetic diversity in the Canadian populations than in the populations in Central America

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