Two particles, A and B$,$ are in uniform circular motion about a common center. The acceleration of particle A is $8\mathrm{.}5$ times that of particle B$.$ The period of particle B is $2\mathrm{.}0$ times the period of particle A$.$ The ratio of the radius of the motion of particle A to that of particle B is closest to A$)$ rA$/$rB $=2\mathrm{.}1$ B$)$ rA$/$rB $=4\mathrm{.}3$ C$)$ rA$/$rB $=18$ D$)$ rA$/$rB $=0\mathrm{.}24$ E$)$ rA$/$rB $=8\mathrm{.}5$