Answer:
Answer is Option D: fire motifs
Step-by-step explanation:
Charlotte Bronte in Jane Eyre uses fire motifs throughout the story. She introduces the idea of a modern individual with the character of Jane Eyre. In the given excerpt as well, we see that Jane faces moments of passion (words like "ridge of lighted heath") and after the flames are shot down, her mind becomes calm ("same ridge, black and blasted").
There is no verbal irony, as Option A, because Jane is speaking her mind. Also, there is no nature imagery or ambiguous language as per Option B and C.