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

Multiple Choice

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 3.37 cm while isotope Y moves along a path 3.58 cm in radius.What is the ratio of the two isotope masses,
?

A) 0.941
B) 1.06
C) 0.886
D) 1.13
E) Not enough information is given.