Two particles A and B are moving with constant velocities `V_(1)=hatj` and `v_(2)=2hati` respectively in XY plane. At time t=0, the particle A is at co-ordinates (0,0) and B is at (-4,0). The angular velocities of B with respect to A at t=2s is (all physical quantities are in SI units)
A. `(1)/(2)rad//s`
B. `2rad//s`
C. `4rad//s`
D. `1rad//s`
