According to best practices, which of the following headlines should be used on this landing page?

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According to best practices, which of the following headlines should be used on this landing page?

1. A) “Have you Been Bamboozled by a Travel Agency?”
2. B) “Learn How to Avoid Being Bamboozled by a Travel Agency?”
3. C) “Free Guide: Avoid Being Bamboozled by a Travel Agency”
4. D) “Download the Free Guide: Avoid Being Bamboozled by a Travel Agency”