Multiple-Object Accelerating Systems: Two boxes, A and B, are connected by a horizontal string S on a horizontal floor. A very light wire pulls horizontally on box B, as shown in the figure, with a force of 100 N. The reaction force to this pull is
A. the pull that box B exerts on string S.
B. the pull that string S exerts on box B.
C. the pull that string S exerts on box A.
D. the pull of box B on the wire.
E. the force that box A exerts on box B.
Answer: D
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