Olivia places her pet frog on a line to observe the frog’s motion. The line is divided into sections that measure 1 centimeter each. The frog begins at 0, moves 18 centimeters forward, moves 6 centimeters backward, and then 12 centimeters backward. What is the frog’s displacement?

Displacement is the net change in position, so treat forward motion as positive and backward motion as negative. The frog’s total is 18 − 6 − 12 = 0 centimeters. Its final position is the same as its starting position, so the correct choice is C, 0 centimeters.

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