How can conjunctive adverbs help achieve coherence? They don't illustrate a relationship.
They provide clarity for the meaning of a preceding noun.
They illustrate the connection between two ideas.
They introduce relative clauses.

They illustrate the connection between two ideas.

Explanation:

A conjunctive adverb is used to create a smooth connection between two sentences or independent clauses. The conjunctive adverb shows the logical relationship between one idea and the next and thus helps to provide coherence in a written text.

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to gain popularity at school, fitzgerald wrote plays for the school and cast himself as the star. he also joined one of the universitys most prestigious clubs.