If [x] is the greatest integer less than or equal to x, what is the value of [-1.6] + [3.4] + [2.7]? GMAT Explanation

If [x] is the greatest integer less than or equal to x, what is the value of [-1.6] + [3.4] + [2.7]?

(A) 3
(B) 4
(C) 5
(D) 6
(E) 7

Correct Answer: A