Read the following paragraph:

"At first glance, all elephants look much the same: large, gray, long trunk. However, there are three separate species of living elephants. These are the Asian, African savanna, and African forest elephants. Asian elephants are shorter and have smaller ears than the other species. Only some of the males and none of the females have tusks. In contrast, both African species have large fan-shaped ears, and both males and females have tusks as adults. The African savanna elephant is the tallest and the lightest in color. It lives in large social groups. African forest elephants have smaller tusks than the savanna species. They form small family groups. In addition to these physical distinctions, DNA studies also show clear genetic differences between the species."

Which choice below is the topic sentence?


A. In addition to these physical distinctions, DNA studies also show clear genetic differences between the species.


B. However, there are three separate species of living elephants.


C. At first glance, all elephants look much the same: large, gray, long trunk


D. These are the Asian, African savanna, and African forest elephants.