Polymer X's reactive functional groups determine reagent compatibility

Steps:

• Examine the diagram for polymer X's repeating units and functional groups.
• Identify groups like esters, amides, or alcohols that react with acids or bases.
• Match choices to reactions: acids hydrolyze esters, bases saponify esters.
• Select reagent that targets the specific group in polymer X.

Why B is correct:

• Reagent B performs hydrolysis on the ester linkages in polymer X's structure, breaking C-O bonds via nucleophilic acyl substitution.

Why the others are wrong:

• A: Aqueous sulfuric acid protonates but does not cleave polymer X's stable backbone.
• C: Sodium hydroxide reacts with acids, not the neutral groups in polymer X.
• D: Lacks reactivity with polymer X's non-redox functional groups.

Not enough information: Diagram and full choices for B/D are missing, preventing precise identification.

Final answer: B