f(g(x)) =. Does this make sense or not?

Question

A) This makes sense because f(x) = x^2 and g(x) = x + 4 so putting in x^2 for x into g gives us x^2 + 4.
B) This does not make sense because the input would first go into g, giving x + 4. Then x + 4 would be the input to f, giving (x+4)^2.