if f x g u and u u x then

I need explanations for this

If f(x) = g(u) and u = u(x) then

(A) f ‘(x) = g ‘(u)

(B) f ‘(x) = g ‘(u) . u ‘(x)

(C) f ‘(x) = u ‘(x)

(D) None of the above

 
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