The excerpt conveying the most emotion from Neil deGrasse Tyson's narrative is the one about receiving a wave of hate mail after Pluto's reclassification.
The portion of Neil deGrasse Tyson's narrative that conveys the most emotion is: "And that's when the real wave of hate mail started coming in." This choice captures the emotional reaction Tyson received from the public upon the reclassification of Pluto. In contrast, the other choices presented are more factual than emotive, focusing on historical events and scientific classification without the personal or emotional engagement that option A demonstrates.