Here is the item again:
To make her ex-boyfriend Brad jealous, Georgia saved her money. To buy a black dress that would turn men’s heads at the winter dance.

You chose to use Punctuation Rule 5 to fix the problem:

Main Clause + Ø + Infinitive Phrase.

Here is the correction:

To make her ex-boyfriend Brad jealous, Georgia saved her money to buy a black dress that would turn men’s heads at the winter dance.

Well done! You deserve those cyber donuts!

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