IMO D.
n is a multiple of 5, we can take 5, and 2 as our counter examples.
5 must be squared to be a multiple of 25.
A) is out b/c if we take 2 = p and (2^2*5) = 20 which is multiple of 5 but not 25.
B) is out b/c if we take 2 = q this time and p = 5 = (2^2*5) = 20 which is multiple of 5 but not 25.
C) pq = 5*2 = 10
D) since both are squared, one of them is going to be 25, so it will be a multiple of 25
E) discounted for the same reason as A and B.
(D)
Multiples
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Source: Beat The GMAT — Data Sufficiency |
