If x = 4 and y = 16, then sq. root of (x+y/xy) is closest to which of the following ?

(A) 1/3

(B) 1/2

(C) 3/4

(D)7/8

(E) 1

[spoiler]OA:B[/spoiler]

Ok so i got stuck in the last step.Simplified and got sq root of 5/4.Now what if I have no clue of wat the value of sq root of 5 is?My ans was C because i know sq root of 4 is 2.So sq root of 5 should be a value 2+.I already have the denominator as 4.So C.CLearly the logic is wrong.

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