C). The lightning storm makes the scene suspenseful and dangerous.
Explanation:
Mood demonstrates certain use of words and descriptions(descriptive language) that elicit the emotional feelings of the readers by creating an atmosphere that appeals to their senses. Huckleberry Finn by Mark Twain is a realistic novel illustrating the conflict of civilization and natural life. As per the question, weather in chapter 29 contributes to the mood by introducing the image of 'lightning storm' to offer an atmosphere that creates suspense and threat in the mind of the readers. Thus, the answer is option C.
