Question

If f(x)=2 sqrt(x) and g(x)=x^2-1, which statement is true?

A) (f◦g)(x)=2(x^2-1)
B) (f◦g)(x)= 2x(x^2-1)
C) (g◦f)(x)=4x^2-1
D) (g◦f)(x)=4x-1