If the man on the left pulls on the object with a force of 500 N and the man on the right pulls on the object with a force of 750 N, what is the net force exerted on the object?
 A. 
 1250 N to the right
 B. 
 1250 N to the left
 C. 
 250 N to the right
 D. 
 250 N to the left