Step 1: Recognize the reference.
This refers to a line from Walter de la Mare's poem *The Listeners*. The poet speaks about a "boy" who is now dead. The line presents a mysterious and melancholic tone.
Step 2: Analyze the options.
- (A) lord: Incorrect. The character is not a lord.
- (B) boy: Correct. The poet knew a boy, as mentioned in the poem *The Listeners*.
- (C) lady: Incorrect. The reference is not to a lady.
- (D) girl: Incorrect. The reference is specifically to a boy.
Step 3: Conclusion.
The correct answer is "boy," as this fits the description in Walter de la Mare's poem *The Listeners*.