Here is the passage again:

Despite Cassandra's stern warning, Alex walked over to flirt with Helen. The most beautiful—and dangerous—woman at the party.

You chose to use Punctuation Rule 9 to fix the problem:

Main Clause + , + Appositive.

The correction looks like this:

Despite Cassandra's stern warning, Alex walked over to flirt with Helen, the most beautiful—and dangerous—woman at the party.

Well done! You deserve that cyber chocolate bar!

Go to the next sentence.

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