Ana is pushing a wheelbarrow of rocks. She stops and unloads half of the rocks. How will this effect the force needed to move the wheelbarrow?
O A. Gravity is increased, making the wheelbarrow easier to move.
OB. Gravity is decreased, making the wheelbarrow harder to move.
O C. Friction is increased, making the wheelbarrow harder to move.
O D. Mass is decreased, making the wheelbarrow easier to move.
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