A Proton,which Moves Perpendicular to a Magnetic Field of 1

A proton,which moves perpendicular to a magnetic field of 1.2 T in a circular path of radius 0.080 m,has what speed? (q_p = 1.6 x 10^-19 C and m_p = 1.67 x 10^-27 kg)

A) 3.4 x 10⁶ m/s
B) 4.6 x 10⁶ m/s
C) 9.6 x 10⁶ m/s
D) 9.2 x 10⁶ m/s