Square root of any positive int always result in one negtive and one positive number. I have solved manhattan 5 lb and questions from numerous other sources. Wherever there are 2 numbers one positive one negative the answer is always D.

Secondly in Q4 if 0 is neither negative nor positive how come it is counted in the following question?:

Four smallest non negative int should be 1 2 3 4 not 0 1 2 3