Take another look at the item:

One day in class, Shantrell rested her head against the wall (A) and discovered (B) that she could hear the classical music that Mr. Nguyen played in his office on the other side. (C) The music promptly put her to sleep.

You wanted to do this:

One day in class, Shantrell rested her head against the wall and discovered, that she could hear the classical music that Mr. Nguyen played in his office on the other side. The music promptly put her to sleep.

A comma after discovered is an error. That she could hear the classical music is a subordinate clause. Generally, you use no punctuation to connect a subordinate clause to the main clause in front.

You might want to review the rules.

Go back to the sentence to try again.

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