Question

Which transformation will always map a parallelogram onto itself?

O A.
a 90° rotation about its center
a reflection across one of its diagonals
OB.
O c.
a 180° rotation about its center
OD.
a reflection across a line joining the midpoints of opposite sides

Answer 1

C..

Explanation:

A rotation of 180 degrees about the center of the parallelogram will do this.