In the above figure, the arrows indicate the direction of forces F1 and F2 and the magnitudes of the respective force are mentioned near the arrows.
Towards which direction will the block move?
Since forces are unequal, they are unbalanced. Unbalanced forces cause motion.
The direction of motion is along the direction of greater force. In this case F1 is the greater force, so body will move along F1 force.
Thus, option A is correct.