He is comparing his heart to an empty nest because he feels alone and depressed, sort of like a feeling of dreary emptiness when viewing a picture of an empty nest.
Answer:
The answer is C, for sure.
Explanation:
<h3>Protagonist</h3>
the central character who has to overcome the main conflict in the story.
<h3>Antagonist</h3>
the character who opposes the lead character and is the main source of conflict.
<h3>Secondary character</h3>
the character with ordinary qualities providing support to important characters.