If f(x), g(x) be twice differentiable functions on [0,2] satisfying f''(x)=g''(x) ,f'(1)=2g'(1)=4 and f(2)=3g(2)=9, then f(x)−g(x) at x = 4 equals
(A) 0
(B) 10
(C) 8
(D) 2