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IS A false ?
No,it is equivalence relation.
they say C is correct
even i also attempt the question in test series.

i dont know much about C but A should be correct.
Well, I found a lot of good questions in this test:)
Its an equivalence relation i.e. option A
@sushant plz check???

aRb <-----> (a divide b) or (b divide a)

its not reflexive so option A , B,  D is incorrect because equivalence have also reflexive and partial order also have reflexive and  Toset have also poset.

option C is correct
@Hradesh Why not reflexive? a divides a is always true.
@air1  i think that here (a divide b) or (b divide a)  but its not say a divide a ?? if i am wrong plz check?? and point it
@Hradesh The question means that for any two elements $a$ and $b$ from set A, $a R b$ (element a is related to b) if $a$ divides $b$ or $b$ divides $a$. Now consider any element of set A, call it $p$. $p$ divides $p$, so $p R p$ so relation R is reflexive.