Answer:
A. square root -4
Step-by-step explanation:
The answer is A because the square root of -4 is 2i which is an imaginary number.
-The square root of -4 is 2i (an imaginary number)
-The square root of 16 is 4
-The square root of 1 is 1
-The square root of 13 is ≈ 3.606
