Answer:
The coordinates of O is (d,c) .
Option (a) is correct .
Explanation:
As given
In the coordinate plane, three vertices of rectangle MNOP are M(0, 0), N(0, c), and P(d, 0).
As MNOP is a rectangle .
Thus opposite sides of the rectangles are equal .
Formula



NM = c units


MP = d units
Thus the coordinate of the O (d,c) .
(This is because opposit sides of the rectangle are equal thus distance of point O from point P must be d and distance of point O from point N must be c .)
Therefore the coordinates of O is (d,c) .
Option (a) is correct .