Take another look at the item:

My appliances are always hungry. (A) For example, the dryer will eat underwear, (B) and the microwave will suck off half a frozen dinner (C) while it is cooking.

You wanted to do this:

My appliances are always hungry. For example, the dryer will eat underwear and the microwave will suck off half a frozen dinner while it is cooking.

Removing the comma after underwear is an error. You have two main clauses joined by and. In such a situation, use a comma before the and.

You might want to review the rules.

Go back to the sentence to try again.

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