Which of the following transformations will make parallel lines p and q coincide with parallel lines p' and q'?
a. counterclockwise rotation 90 about the origin
b. counterclockwise rotation 90 about the origin, followed by translation 4 units to the left
c. reflection across the x-axis, followed by a counterclockwise 90 rotation about the origin
d. reflection across the line y-axis, followed by a counterclockwise 90 rotation about the origin