Which explanation best describes the answer to this problem?
A rock collectors convention has 604 people signed up to attend. The convention organizers want to put 28 people in each room during the group discussion time.

How many rooms does the convention need for the discussion groups?

A.Divide 604 by 28. The answer is 21 with 16 left over. So the convention needs to have 21 rooms.

B.Divide 604 by 28. The answer is 21 with 16 left over. So the convention needs to have 22 rooms.

C.Multiply 604 by 28. The answer is 16,912. So the convention needs to have 16,912 rooms.

D.Multiply 604 by 28. The answer is 17,000. So the convention needs to have 17,000 rooms.