Two Blocks, a and B, Are Being Pulled to the Right

question 10

Multiple Choice

Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal 100-N pull, as shown in the figure. Both of them are moving together at a constant velocity of 2.0 m/s to the right, and both weigh the same.
-Which of the figures below shows a correct free-body diagram of the horizontal forces acting on the lower block, B?

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