答案：B

解析：

Choice B is the best answer. According to the passage, "content that makes readers or viewers feel a positive emotion like awe or wonder is more likely to take off than content that makes people feel sad or angry, though causing some emotion is far better than inspiring none at all." This suggests that the average score for the likelihood of sharing a video that makes viewers feel sad would be higher than that for a video that inspires no emotion ("neutral," 1.51) and lower than that for videos that inspire a positive emotion ("cute," 4.62, and "funny," 4.81). Therefore, it seems most likely that the average score for a video categorized as "sad" would be between 1.51 and 4.62.