Which of the following best describes conjunctive adverbs?

Conjunctive adverbs are unique in that they function similarly to conjunctions by connecting ideas between independent clauses, providing a smooth transition between thoughts. These adverbs can indicate various relationships such as contrast, addition, or cause and effect, enhancing the overall coherence of writing. For instance, words like "however," "therefore," and "moreover" serve as conjunctive adverbs, linking complete sentences while also adding meaning.

The other options do not accurately capture the role of conjunctive adverbs. Adverbs that modify adjectives focus on the description of adjectives rather than the relationship between clauses. Those that describe verbs do not perform the connective function that defines conjunctive adverbs. Finally, while adverbs can influence sentence structure, this is not a defining characteristic of conjunctive adverbs. Instead, their primary function is the connective one, which is why the second choice is the best description.