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 = 300 n
right = 400 n
down = 300 n
left = 400 n

d.
up = 550 n
right = 200 n
down = 550 n
left = 200 n

I would say A because if you think of it like a compass then all of the other answers the compass would be even on both sides because the two sides have the same number or direction, but with A there is one odd number to make it unbalanced and make it move because if it is unbalanced it cant stay the same direction, and it has to move if its not equal all the way around 

i hope this makes sense and that i helped you!

The plates kept rubbing together