Below are the choices that can be found elsewhere:
A: The change in the linear approximation to f; dy depends on f'(x) and the differential dx.
B: The change in f; dy depends on f'(x) and the differential dx.
C: The change in f; dy depends on the differential dx only.
D: The change in the linear approximation to f; dy depends on the differential dx only.
I think the answer is A.
