Answer:
D (the last choice)
Step-by-step explanation:
Basics : choice A) (a)^x . (b)^y = (ab)^x+y so the exponents are added which is 1 wrong alternative.
choice B) (a)^x/(b)^y = (a/b)^x-y similarly, the exponents are subtracted ...so it's also the wrong choice.
choice C) (a)^x . (b)^y = (ab)^x+y ...wrong again.
choice D) lastly (a^x)^y = a^xy and so we can see that the exponents are multiplied here.
