Final answer:
The most effective sentence to move the plot forward is about the author's responsibilities at work.
Step-by-step explanation:
The paragraph is from a personal narrative, a type of writing that tells a story from the author's perspective. In this paragraph, the author is describing their excitement for their first day working as a waitress at Pete's Pizza Haven. To most effectively move the plot forward, the sentence that should be added after sentence 6 is: O Once I arrived, I quickly learned that my job would also entail wiping tables, mopping floors, and washing dishes. This sentence would introduce a new development in the story and show the challenges and responsibilities the author encountered in their new job.
Learn more about Plot development in a personal narrative