A particle of charge −q travels with velocity v=v0(2i^−j^+k^) in a uniform magnetic field B=B0(i^+3j^+2k^). Which one of the following is the unit vector in the direction of the magnetic force on the particle?
a) (1/83)(−5i^−3j^+7k^)
b) (1/83)(5i^−3j^+7k^)
c) (1/83)(5i^+3j^−7k^)
d) (1/17)(2i^−3j^+2k^)