Carbon-12 and Carbon-14 Atoms,(12 and 14 Atomic Mass Units,respectively)each Missing

Carbon-12 and Carbon-14 atoms,(12 and 14 atomic mass units,respectively) each missing one electron,so that they carry +1e electric charge,pass through a velocity selector (therefore have the same speed) and then pass through a hole in a vertical lead plate into a region of uniform magnetic field,also oriented vertically.What is the ratio of the radii of curvature r₁₂/r₁₄ for these two atoms' paths?

A) 0.86
B) 0.93
C) 1.1
D) 1.2
E) None are correct.