Verbal irony. she’s being sarcastic
The purpose of exposition (or expository writing) is not primarily to amuse, but to enlighten and instruct. The objective is to explain and analyze information by presenting an idea, relevant evidence, and appropriate discussion. Its essential quality is clarity.
Answer:
Songs of Experience
Explanation:
Because this book is related to to The Poison Tree due to the fact that he should experience the situation that is taking place at that moment.