Two forces, F1 and F2 (with F1 > F2), act on an object of mass m. The two forces act along the same line but in opposite directions. Which formula gives the acceleration of the object due to these forces?

A) (F1 – F2) / m
B) (F1 + F2) / m
C) m / (F1 + F2)
D) m / (F1 - F2)