20. Rectangle PQRS is shown below. Point C is
Maggie claims that there are transformations that preserve the length of the rectangle's
sides. Which of the following transformations could NOT be used to support Maggie's
claim?
A. A reflection over the side RS
B. A rotation of 90° clockwise about vertex Q
C. A dilation of scale factor 1 through center C
D. A vertical stretch of scale factor 2 through center C