C, because the other choices are not that interesting nor important
You would use and interrogative statement.
The adjective here is tall.
Answer:
"often considered witty"
Explanation:
A subject complement is a word that describes the subject of a sentence that follows immediately after a linking verb. Like the name suggests, it complements the subject. It can either be a noun, adjective or pronoun.
Therefore, the subject complement from the sentence "Bret Hartes' poems and prose were often considered witty" is "often considered witty".