求助数学~~谢谢！

kristytttt

if n is a multiple of 5 and n=p^2*q  ,where q and p are prime numbers, which of the following must be a multiple of 25?
A P^2
B q^2
C pq
D p^2*q^2
E p^3*q


答案是D
whywhywhy   求助谢谢！