B. It is moved to the right by a combined force of 15 N
That is because since the left side has more force than the 5 N right side, the box would be moving to the right. Altogether the box would have a combined of 15 N
The answer is C as there is more force on the left side ( excess of 5 N) which therefore pushed it to the right with a force of 5 N!
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