Probabilistic RSA, IND CPA
I think i got it.

Query:

Let $m={1,2}$, and query $oracle(m)=(A,B)$

Checking:

Lets compute $s=B^e=(m^er^e)^e=m^{e^2}A$

Lets compute $sA^{-1}=\frac{m^{e^2}r^{e^2}}{r^{e^2}}=m^{e^2}$

if $s=1$ then $m=1$, $m\neq 1$ otherwise

Hopefully logic holds.