U.S. Army Mental Tests, 1917

I decided that for the next while, I would post one question a day from Test 3 of the U.S. Army Mental Tests, given in World War I. These notoriously subjective and racist tests only helped confirm already existing stereotypes about America's diverse population to the nation's white Anglo-Saxon elite.

1. Cats are useful animals, because

A. they catch mice
B. they are gentle
C. they are afraid of dogs