The figure below is a regular hexagon ABCDEF with center O. (P, Q, R, S, T, and U are the midpoints of the sides.)
Which of the following rotations is not a symmetry of the regular hexagon?
A. a 120° counterclockwise rotation with center O
B. a 180° clockwise rotation with center O
C. a 90° clockwise rotation with center O
D. a 60° clockwise rotation with center O
E. none of these
Answer: C
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