Answer:
D
Step-by-step explanation:
A is the second best choice, but it is not the answer.
(fog)x means wherever you see an x in f(x), you put g(x)
So f(x) = f(g(x)) = x + 7 = g(x) + 7 = 1/x + 7
Since g(x) = 1/x then f(g(x)) = 1/x + 7
