Take another look at the item:

To get on his mother's good side, (A) Rufus offered to unpack the groceries, (B) but dropped the carton of eggs that Mom would later need (C) to make chocolate-broccoli muffins for the church bake sale.

You wanted to do this:

To get on his mother's good side Rufus offered to unpack the groceries, but dropped the carton of eggs that Mom would later need to make chocolate-broccoli muffins for the church bake sale.

The comma after side is necessary. To get on his mother's good side is an infinitive phrase. When a phrase of this type introduces a main clause, you need a comma to attach it.

You might want to review the rules.

Go back to the sentence to try again.

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