A Box Is Pushed Across a Horizontal Table at Constant

A box is pushed across a horizontal table at constant speed.Of the forces on it,which pair do we know are equal in magnitude because of Newton's third law?

A) Normal force on the box and the weight of the box.
B) Normal force on the box and the normal force on the table by the box.
C) The force of kinetic friction on the box and the force applied to the box by the one pushing it.
D) None of these are interaction pairs.

Correct Answer:

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