The correct answer to this question is reliable which is the adjective. An adjective is a descriptive word used to describe objects, nouns, people and things.
I bought a car from a reliable salesperson.
Reliable is the adjective because it is describing the salesperson in this sentence.
Does this word describe something?
What in the sentence does this word describe?
How does it add something important to the story?
This is true. The line "Fainting I follow, I leave off therefore" contains both a caesura and alliteration that are each offset by the other--contributing to the power of both.
The answer is all of these.
The Duke is the speaker of the poem where he is entertaining an emissary who has come to negotiate the Duke's marriage. As he shows the visitor through his palace, they came across the portrait of the late Duchess. The Duke then began to reminisce about the portrait sessions and then about the Duchess herself. As his monologue continues, the reader realizes that it was the Duke who caused the untimely demise of the previous Duchess.
C. a textbook because they used a primary source to make the textbook and they could have left information out or slightly altered some events.