A uniform magnetic field `B=B_(0)hatj` exists in space. A particle of mass m and charge q is projected towards X-axis with speed v from a point (a,0, 0). The maximum value of v for which the particle does not hit the Y-Z plane is
A. `(Bqa)/m`
B. `(Bqa)/(2m)`
C. `(Bq)/(am)`
D. `(Bq)/(2am)`