(x^2)^(1/2) = +x and not
as in -
9^(1/2) is always taken as +3
However, when we have a situation x^2 = 9, then we have to take into consideration of x = 3 and x = -3 !
Can also see the same in OG 11TH edition P-126 under Modulus
"note that (x^2)^(1/2) denotes the non-negative square root of x^2"
So if we consider the above, answer A