Take another look at the item:

Darryl has the messiest book bag (A) of anyone Rachel knows; (B) he essentially has a compost pile rotting in the main compartment. (C) For instance, pistachio shells, pencil shavings, and a brown banana.

You wanted to do this:

Darryl has the messiest book bag of anyone Rachel knows, he essentially has a compost pile rotting in the main compartment. For instance, pistachio shells, pencil shavings, and a brown banana.

Changing the semicolon to a comma is a mistake. You have two main clauses at this juncture, and a comma is too wimpy a punctuation mark to connect them. There is a fragment. Look more closely!

You might want to review the rules.

Go back to the sentence to try again.

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