Question 397774
The displacement vector is A +B = i + 2j + 3k  + 3i + 5j + 8k = 4i + 7j + 11k.
The work is the dot product of the force vector and the displacement vector:

F*(A + B) = ( 2i – 5j + 3k)*(4i + 7j + 11k) = 8 - 35 + 33 = 6 units.

The answer is a.