A Positively Charged Particle Has a Velocity in the Negative

Multiple Choice

A positively charged particle has a velocity in the negative z direction at point P.The magnetic force on the particle at this point is in the negative y direction.Which one of the following statements about the magnetic field at point P can be determined from this data?

A) Bx is positive.
B) Bz is positive.
C) By is negative.
D) By is positive.
E) Bx is negative.