Which of these is the best summary of this letter?

A.
The sixth grade students at King Valley Middle School explain the values of the trees to convince their principal to keep them from being cut down.

B.
The sixth grade students at King Valley Middle School ask their principal to think about the money that would be saved if they didn't use air conditioners.

C.
The sixth grade students at King Valley Middle School explain to their principal that the trees are a part of their families' history and should be left alone.

D.
The sixth grade students at King Valley Middle School remind their principal that the trees have been on their school since 1950, which is why they're so big now.

D. The sixth grade students at King Valley Middle School remind their principal that the trees have been on their school since 1950, which is why they're so big now.