If N = 16 × 10^(-p) and −4 < p < 4, how many different integer values of p will make N a perfect square?  Choose the correct answer:  A) 0  B) 2  C) 3  D) 5  E) 7

Rationale: i think the answer should be c . thoose are p - values that satisfy given restriction : - 2 , 0 , 2 ( note , a fraction can be also a perfect square ) - - > 16 * 100 , 16 * 1 , 16 / 100
Answer: C