Respuesta :
Without a doubt I can say that the last of options represented above is the only correct answer that fills this gap in proper way. Conjunctive adverbs provide causes, sequence and comparison in the sentence so that is coincides with the usage of the words above. So, the full statement goes like this :
The words also, however, instead, and therefore are examples of conjunctive adverbs.
The words also, however, instead, and therefore are examples of conjunctive adverbs.
The correct answer is conjunctive adverbs. The complete sentence would be, The words also, however, instead and therefore are examples of conjunctive adverbs. These are words that are often used in the sentence to connect two clauses which makes them a conjunction.