Answer:
The answer is letter a. Conjunctive adverb.
Explanation:
Adverbs are words that modify a verb, an an adjective or another adverb. It can also be used to modify a clause or a sentence.
In the example sentence above, "Andrew Carnegie was a poor immigrant; however, he later became a millionaire in the steel business," "however" functions as a "conjunctive adverb."
Conjunctive adverbs are adverbs that are used to connect two independent clauses (can stand alone) together. Examples of these are: therefore, otherwise, next, however, nevertheless, then, finally, etc.
Going back to the sentence above, the two independent/main clauses are: "Andrew Carnegie was a poor immigrant" and "he later became a millionaire in the steel business."
