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Converting Directed Graph to Relation

ALGOR-QNUFER

Consider the following directed graph.

Which of the following ordered pairs are all in the relation depicted by this directed graph?

A

$\{(1,2),(2,2),(2,3),(2,4)\}$

B

$\{(1,2),(4,2),(2,3), (3,3)\}$

C

$\{(1,2),(4,2),(3,2),(2,4)\}$

D

$\{(1,2),(2,1),(2,3),(2,4)\}$