It should always contain a signature
The correct answer is plot. Theme is the work's main idea (the "why" of the work), and there usually are more themes in a single work. Narrator is the "I" of the story, someone who tells it. The setting is the "when and where" of the story, the time-place frame. The plot is the "what" - what happens.
Answer:
The speaker feels excited, and wants to read books. It describes how they have a yearning in their heart to read, these books that make them feel like they're in another world, and it's all at his fingertips.
Issues that you should look for to correct the proofreading stage:
Grammar
Spelling
Punctuation
