Two Singly Ionized Isotopes,X and Y,of the Same Element Move

Two singly ionized isotopes,X and Y,of the same element move with the same speed perpendicular to a uniform magnetic field.Isotope X follows a path of radius 3.29 cm while isotope Y moves along a path 3.43 cm in radius.What is the ratio of the two isotope masses,

A) 0.959
B) 1.04
C) 0.920
D) 1.09
E) ​Not enough information is given.