Answer:
B. when you want a longer quotation from the text to support an argument in your essay
Explanation:
A block quote is usually a larger quote that contains around 4 or more lines. It is used to directly quote larger sections of text to support an argument. It is not used for quotes of small phrases or to paraphrase, so A and C are wrong.
<h2>Not the answer: </h2><h3> I don't know, maybe ask someone else.</h3>