The number 90 can be written as the sum of the squares of 3 different positive integers. What is the sum of these 3 integers?

(A) 17

(B) 16

(C) 15

(D) 14

(E) 13

The three squares are 16, 25 and 49 and they add to 90. And the three numbers 4 +5+7 = 16 should be the answer. But answer is D and I know how to get D as well. But I need to know why 16 is not correct or where I am making mistake please.

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E.

MGMAT 1 --> 530

MGMAT 2--> 640

MGMAT 3 ---> 610

GMAT ==> 730