A particle of mass in is moving in a circular with of constant radius `r` such that its contripetal accelenation `a_(c) ` is varying with time `t` as `a_(c) = K^(2) rt^(2)` where K` is a constant . The power delivered to the particles by the force action on it is
A. `2pi m k^(2) r^(2) t`
B. `m k^(2) r^(2) t`
C. `(m k^(4) r^(2) t^(5))/(3)`
D. Zero
