Two particles `X` and `Y` with equal charges, after being accelerated throuhg the same potential difference, enter a region of uniform magnetic field and describe circular paths of radii `R_(1)` and `R_(2)` respectively. The ratio of the mass of `X` to that of `Y` is
A. `(R_(1)/R_(2))^(1//2)`
B. `R_(2)/R_(1)`
C. `(R_(1)/R_(2))^(2)`
D. `R_(1)/R_(2)`