Take another look at the item:

Mackenzie had to leave the room, (A) for her father was noisily crunching raw radishes, (B) which produced so annoying a sound (C) that studying was impossible.

You wanted to do this:

McKenzie had to leave the room. Because her father was noisily crunching raw radishes, which produced so annoying a sound that studying was impossible.

Adding a period after room makes a fragment. Because her father was noisily crunching ... begins a subordinate clause. Remember that a subordinate clause cannot stand alone as a complete sentence.

You might want to review the rules.

Go back to the sentence to try again.

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