Here is the item again:

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 correctly realized that the comma after groceries was wrong. But dropped the carton of eggs is a lonely verb phrase. Such a phrase does not require a comma when you attach it to the main clause in front.

You chose to do this:

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

Providing the subject he for the verb dropped and then making this subject-verb pair a separate sentence is an excellent way to fix the problem. Well done!

Go to the next sentence.

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