The correct answer here is B. To understand why, think about anything that's stationary right now, for example the screen on your computer. You know that it cannot be true that no force is acting on it. After all, every object on Earth is being acted on by gravity at every moment.
So how come some objects don't move if gravity is acting on them? It's because there are other forces that cancel out the force of gravity. In this case, it's something called the "normal force" which is the term for the force that opposes gravity.
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