Let f (x) and g (x) be differentiable for 0 < x < 1 such f(0)= 0 , g (0) =0, f(1)=6. Let there exist a real number c in (0, 1) such that f’ (c) =2g’ (c), then the value of g (1) must be
A) 1
B) 3
C) 2.5
D) -1