Your answer would be D)
would remain as that, which is has in option D.
would be 1/y³, as when you put a value to a negative exponent you get the reciprocal. Multiplying something by 1/y³ could be written as a fraction over y³, which D is.
would be √z, as when you put a value to the power of a fraction, you root it to whatever the denominator is. For example, 9^1/2 = 3 because √9 is 3.
Combining all of these gets you answer D, as it has √z, 1/y³, and x^6.
I hope this helps!