Take another look at the passage:

While Kristy labored through another evening of incomprehensible accounting homework, her roommate Bob read a sci-fi novel. And ate an entire bag of potato chips.

You chose to connect the lonely verb fragment to the main clause in front, like this:

While Kristy labored through another evening of incomprehensible accounting homework, her roommate Bob read a sci-fi novel, and ate an entire bag of potato chips.

Unfortunately, you cannot connect these two parts with a comma. Review the rules.

Go back to the sentence to try again.

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