Although abundant in many areas of the southern United States, the evening bat has always been uncommon to rare across the northern part of its range―most of Illinois, Indiana, and Ohio―their already small populations decreasing even further during the latter part of the twentieth century.

Although abundant in many areas of the southern United States, the evening bat has always been uncommon to rare across the northern part of its range―most of Illinois, Indiana, and Ohio―their already small populations decreasing even further during the latter part of the twentieth century.
A . their already small populations decreasing
B . and already low populations decreased
C . and their already small populations decreased
D . their already low numbers decreasing
E . and its already low numbers decreased

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Answer: D