Harold and his friend are taking turns playing a game. Harold scored 20 points during his turn. So far, his friend has scored 9 points.

Which equation can be used to find how many more points Harold's friend needs to score, p, in order to tie Harold?
A.
20p = 9
B.
9 + p = 20
C.
20 + p = 9
D.
9p = 20