Two particles X and Y having equal charges, after being accelerated through 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 masses of X and 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))`