Explanation:

- Mo's room is lit because he reads late. This shows his passion for books.

- Meggie shares Mo's love for reading, suggesting a deep connection through books.

- When Meggie has nightmares, she finds comfort with Mo, hinting at a strong bond.

- Meggie falls back asleep to the calmness of Mo's presence and the sound of pages turning.

- The options involve prepositions that indicate position:

- Against: Implies contact or support by touching.

- Around: Implies surrounding or encompassing.

- Beside: Implies being next to or alongside someone.

- Behind: Implies being at the back of someone.