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.

A period after desk makes a fragment. Sending a shower of diet cola ... is a participle phrase and 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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