The correct option is D (6, 3)
Two pairs of opposite sides of the parallelogram are equal in length.
Length of PQ = (Abscissa of Q) – (Abscissa of P)
= 5 – 1 = 4.
∴ Length of SR = 4
(Abscissa of R) = (Abscissa of S) + Length of SR
= 4 + 2 = 6
Ordinate of R = Ordinate of R = 3
∴ Coordinates of R are (6, 3).