Which sentence contains a comma mistake? Use the "Basic Mechanics Resource" if needed.

Question

"The two student council president candidates will now make a final statement before the vote," announced the principal.
Amy said, "I will work for us to have less homework if you vote for me."
"I promise to fight for starting school later and having a longer lunch break", Caleb stated.
The principal replied, "That concludes the debate, which means that voting for candidates can now begin."

Answer 1

The sentence that contains a comma mistake is:

"I promise to fight for starting school later and having a longer lunch break", Caleb stated.

The correct placement of the comma should be before the closing quotation mark, like this:

"I promise to fight for starting school later and having a longer lunch break," Caleb stated.