Take another look at the item:

As all of her classmates were sharing results (A) Melody quietly left the room (B) and found a quiet corner in the hallway (C) so that she could see her grade without embarrassing herself in front of her friends.

You wanted to do this:

As all of her classmates were sharing results Melody quietly left the room, and found a quiet corner in the hallway so that she could see her grade without embarrassing herself in front of her friends.

A comma after room is an error. And found a quiet corner in the hallway is a lonely verb phrase. When you connect such a phrase to the main clause in front, you do not use a comma.

You might want to review the rules.

Go back to the sentence to try again.

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