Take another look at the item:

As Alex squeezed down the narrow row of chairs. (A) His heavy book bag bumped the large soda perched on a desk, (B) sending a shower of diet cola into Teresa's lap, (C) soaking her jeans.

You wanted to do this:

As Alex squeezed down the narrow row of chairs. His heavy book bag bumped the large soda perched on a desk, sending a shower of diet cola into Teresa's lap soaking her jeans.

Removing the comma after lap is an error. Soaking her jeans is a participle phrase. You will often use a comma to connect a participle phrase to the end of a sentence.

You might want to review the rules.

Go back to the sentence to try again.

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