Answer:
(C) 150 N to the left
Step-by-step explanation:
It is given that,
Force acting in left side, F = 450 N
Force acting in right side, F' = 300 N
Let left side is taken to be negative while right side is taken to be positive. So,
F = -450 N
F' = +300 N
The net force will act in the direction where the magnitude of force is maximum. Net force is given by :

So, the net force on the table is 150 N and it is acting to the left side. Hence, the correct option is (c).