Relation - is relatively prime.
Check Reflexive property:
aRa is not relatively prime . Hence not reflexive
Check Irreflexive property:
aRa
Ex. (4,8) is not relatively prime. Hence not Irreflexive
Check Symmetric property:
aRb => bRa
(3,4) is relatively prime and (4,3) also relatively prime. Hence Symmetric.
Check Transitive property:
aRb &bRc then aRc
Proof by Counter Example:
Ex:
(3,5) is relatively prime
(5,6) is relatively prime
but (3,6) is not relatively prime
Hence not transitive.
So option D is correct.