Answer:
The phrase in this excerpt from Louisa May Alcott's Little Women that best illustrates a mocking tone is: "In her own opinion at least."
Step-by-step explanation:
This line has a mocking tone because it is ironic; the speaker tells the reader how Amy is an important person, but adds that this is proclaimed by herself. Here the writer uses a mocking tone because it is funny that she proclaims herself as "an important person". She is the youngest and still has a high self esteem and clearly believes a lot of herself, which, by the way, is a good thing; it means she loves herself and respects her existence, but it does sound funny coming from her own mouth.