The kinetic energy of a particle moving along a circle of radius $$R$$ depends upon the distance covered 's' as $$KE = as^2$$ where $$a$$ is a constant. The magnitude of the force acting on the particle as a function of 's' is

A

$$\frac{2as^2}{R}$$

B

$$\frac{2as^2}{m}$$

C

$$2as$$

D

$$2as\sqrt{1 + \frac{s^2}{R^2}}$$