In which case will the object move due to an unbalanced force?

A.
Up = 300 N
Right = 300 N
Down = 300 N
Left = 250 N

B.
Up = 450 N
Right = 450 N
Down = 450 N
Left = 450 N

C.
Up = 550 N
Right = 200 N
Down = 550 N
Left = 200 N

D.
Up = 300 N
Right = 400 N
Down = 300 N
Left = 400 N

Question

In which case will the object move due to an unbalanced force?	
 
 A.
Up = 300 N 
Right = 300 N 
Down = 300 N 
Left = 250 N
 
 B.
Up = 450 N 
Right = 450 N 
Down = 450 N 
Left = 450 N
 
 C.
Up = 550 N 
Right = 200 N 
Down = 550 N 
Left = 200 N
 
 D.
Up = 300 N 
Right = 400 N 
Down = 300 N 
Left = 400 N

anonymous · Answer

Just compare the values of forces applied in each direction. Up-Down , Left-Right
Which answer has unbalanced (different) values in any of the directions?

anonymous · Answer

for example, in case B, since Left: 450N and Right : 450N
the left-right , or horizontal direction is balanced...
and the same for the vertical, up-down, direction, since: Up: 450N and Down: 450N
try with the other possible answers...