Please check my answer just to be safe :)

The diagram below shows the fossil record of bivalves over millions of
years.The change observed in the fossil record supports which of the following statements?

A) Species can change very little for a long time, and then undergo dramatic change over a relatively short period of time, followed by another long period of little change.

B) Species can change drastically, multiple times, over very short periods of time.

C) Species can change drastically for a short period of time, and then undergo very little change over a long period of time, followed by another short period of drastic change.

D) Species can change gradually and consistently over a very long period of time.