Answer & Explanation goes here
Answer: C .
Explanation:
1 alone:
p and q are positive integers, p.q = 225 = 3.3.5.5. Therefore p and q can have any values.
Suppose, p can be 9, and q can be 25 (YES) – q is multiple of 5.
p can be 25 and q can be 9 (NO) – q is not a multiple of 5.
Insufficient
2 alone:
p is a single digit integer and nothing about q.
Insufficient
1 and 2 together:
p.q = 225 and p is a single digit integer.
So p can be 1, 3, 5 or 9 and corresponding values of q are 225, 75, 45, and 25(YES) – in each case ‘q’ will be multiple of 5.
Sufficient
Hence the correct answer C.