By reading the text you could find the following items: -
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The theme of the text ( the subject)
The question that arises the author
The thesis (the answer to the question)
- Expose the different moments di text (the antithesis/ the thesis/ the solution)

It has to be probably c

Delegates: representatives who cast votes at a political party's national convention. binding: if a primary or caucus is “binding” that means the delegates won in that contest are legally bound to vote for a particular candidate at the parties national convention.a primary is a preliminary election used to determine a party's nominee for a specific office. the winner of the party's caucus, or primary, wins the party nomination for that state. then the delegates meet at their party's national party convention, which is a formal gathering of all party delegates from all states.