A Particle (M = 3 $\mu$ G, Q = 50 $\mu$ C) Moves in a Uniform Magnetic Field Given by ()

A particle (m = 3.0 $\mu$ g, q = 5.0 $\mu$ C) moves in a uniform magnetic field given by () mT.At t = 0 the velocity of the particle is equal to () m/s.The subsequent path of the particle is:

A) circular with a 50-cm radius.
B) helical with a 6.3-cm pitch.
C) circular with a period of 31 ms.
D) helical with a 40-cm radius.
E) none of the above