Final answer:
Lewis uses the symbolic meaning of the red lizard to highlight the protagonist's internal struggle, aiding in the expression of personal growth and the battle against inner demons.
Step-by-step explanation:
The symbolic meaning of the red lizard made clear by Lewis is B. To illustrate the protagonist's internal struggle. Lewis uses symbols to communicate complex themes and to convey a deeper understanding of his characters' internal conflicts and moral choices.
In literature, symbols such as the red lizard serve to express connotative or suggestive meanings that enable multiple interpretations and can provide insightful revelations into a character's psyche or the broader narrative. For Lewis, making the symbolic meaning of the red lizard clear in the story serves to highlight the importance of personal growth and the difficult process of overcoming one's inner demons or vices.
The red lizard represents the protagonist's temptations and sinful desires that he must confront and overcome in order to achieve spiritual growth. Through the clear symbolism of the red lizard, Lewis emphasizes the importance of the protagonist's internal battle and conveys a moral lesson about the power of self-control and the necessity of resisting temptation.
Therefore answer is D. To convey a moral lesson.