Final answer:
An example of allusion in Mrs. Bertha Flowers is a mention of a classic novel during a character's conversation. Option B.
Step-by-step explanation:
An example of an allusion in Mrs. Bertha Flowers is B. A mention of a classic novel during a character's conversation.
Allusion is an indirect reference to another work or text. In this case, if a character in the story mentions a classic novel, it would be considered an allusion as it indirectly refers to that work without explicitly naming it.
For example, if a character says something like, 'It reminded me of the love story between Romeo and Juliet,' that would be an allusion to Shakespeare's play, Romeo and Juliet.
So Option B is correct.