Bank Failures in the United States Occurred

Bank failures in the United States occurred

A) frequently through the 1960s and declined since then.
B) infrequently through the 1960s and have become more common since then.
C) frequently through the 1930s, declined after that time, and became more common in 2008.
D) infrequently through the 1930s, increased after that time, and became less common in 2008.