The correct options are
A Diethyl ether
B 2-Methoxypropane
C 1-Methoxypropane
The metamerism arises when different alkyl groups are attached to same functional group. Diethyl ether, 2-methoxypropane, and 1-methoxypropane have the same functional group and molecular formula but different alkyl group present in the functional group. Therefore, they are metamers.