The correct answer is C. To help show that books were a source of comfort and imagination for the speaker.
Step-by-step explanation
An allusion is a concept linked to the action of referencing an object, situation, character, or another with another. Allusions work like reviews about something. In the text, the author alludes to the book "The Lion, the Witch, and the Wardrobe" by saying "And Mrs. Long opened that wardrobe but no lions or witches scared me", which shows for the speaker books represent comfort because he is not afraid of reading and they are related to the imagination as there is a reference to imaginary creatures and worlds. So the correct answer is C.