How to proceed in such questions.
Consider set $R = {(1, 1), (2, 1), (3, 2), (4, 3)}$. If set $P = R^1 \cup R^2 \cup R^3, $ then which of the following represents the set P? $(R^2 = R^1oR^1 i.e.$ composition of R with R)
A {(1, 1) (2, 1) (3, 2) (4, 1) (4,2), (4,3), (3,1)
B {(1, 1) (2, 1) (3, 2) (4, 1) (4,2), (4,3), (3,3)
C {(1, 1) (2, 1) (3, 2) (4, 4) (4,2), (4,3), (3,1)
D {(1, 1) (2, 1) (2, 2) (4, 1) (4,2), (4,3), (3,1)