Concept: Basically there are three relations in function relation
a) Reflexive Relation (aRa),
b) Symmetric Relation aRb ⇒bRa ,and
c) Transitive Relation aRb and bRc ⇒cRa
Here, all alphabets are in their usual meanings
(i) Reflexive Relation: A relation R is said to be reflexive on X if (x,x) belongs to R such that every x belongs to set X.
In the given question the statement is RS = RS
It means RS element has its own image as RS
Hence, the statement RS = RS will be reflexive.
Therefore, the correct option will be B)reflexive.