A Deuteron, with the Same Charge but Twice the Mass

Multiple Choice

A deuteron, with the same charge but twice the mass of a proton, moves with a speed of 6.0 * 10⁵ m/s perpendicular to a uniform magnetic field of 0.20 T. Which of the paths described below would it follow? (q_p = 1.6 * 10 ^{- 19} C and m_d = 3.34 *10 ^{- 27} kg)

A) a circular path of 6.3-cm radius
B) a circular path of 1.6-cm radius
C) a circular path of 3.1-cm radius
D) a straight line path