Forces of magnitude 5 and 3 units acting in the directions `6hati+2hatj+3hatk` and `3hati-2hatj+6hatk` respectively act on a particle which is displaced from the point (2,2,-1) to (4,3,1) the work done by the forces is

Options

A. 148 units
B. 148/7 units
C. 78/7 units
D. none of the above

Answer

B