Final answer:
The author's choice of metaphor comparing problem-solving to a 'productive fire' fueled by 'kindling of enthusiasm' reflects a passionate and optimistic tone, best aligned with option B, indicating the author's excitement and desire to inspire others.
Step-by-step explanation:
The author's choice to describe problem-solving as a "productive fire" fed by "kindling of enthusiasm" indeed reveals much about the tone in the article. This phraseology conveys a strong sense of passion and optimism. It doesn't suggest anger or impute blame for apathy but rather communicates a vivid and positive image of how a spark of interest can lead to significant outcomes.
This reflection permits us to conclude that option B - It parallels her own excitement for not only making a difference, but inspiring others to do so as well - appears to be the most accurate interpretation of the author's tone.