One of the following is an example for cation exchanging resin
Copolymer of phenol formaldehyde – amine formaldehyde
Copolymer of styrene – divinyl benzene
Copolymer of phenol formaldehyde and styrene
Copolymer of amine formaldehyde and divinely benzene
(B) Copolymer of styrene – divinyl benzene
Explanation: