ANSWER
B. C(7,5) and D(7,1)
EXPLANATION
The coordinates of A are (2,5).
The coordinates of of B are (2,1).
To form a rectangle, the y-coordinates of the remaining two points should be
(a, 5) and (a,1) because A and B have the same y-coordinates.
The x-coordinates of the remaining two points should also be the same because this is a vertical line.
From the options, the best choice is
C(7,5) and D(7,1)
The correct choice is B.
