Select the correct answer.
If quadrilateral ABCD rotates 90° counterclockwise about the origin, what are the coordinates of A′ in quadrilateral A′B′C′D′ ?
A.
(2, 1)
B.
(-2, -1)
C.
(-2, -2)
D.
(-2, 0)
A' ( -2, -1 )