Here is the item again:

When Kate saw the grayish worm on the dissection tray. (A) She folded her arms (B) and refused to pick up the scalpel (C) even though she would earn a zero in lab.

You correctly realized that the period after tray created a fragment. When Kate saw the gray worm on the dissection tray is a subordinate clause, so it cannot stand alone as a complete sentence.

To fix this fragment, you chose to do this:

When Kate saw the grayish worm on the dissection tray, she folded her arms and refused to pick up the scalpel even though she would earn a zero in lab.

You have correctly employed Punctuation Rule 2:

Subordinate clause + , + main clause.

Continue making that beautiful music!

Go to the next sentence.

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