A. 343
B. 196
C. 28
D. 14
E. 7

Answer: D

Explanation:
Rule:
1. Find the prime factorization of the given number.
2. For a perfect square, the Power of the primes must be divisible by 2.
So here,
a. Prime factorization of 3150 is 3150 = 32 * 52 * 7 *2
b. If it’s a perfect square, the power of the primes must be divisible by 2. So here 3 and 5 have powers that are divisible by 2 but not 2 and 7. So we have multiple given numbers with a minimum of one two and one seven to make it a perfect square. So, 2*7 = 14

So, the answer is D.

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