Which action would violate the Ninth Amendment?

speaking with a pharmacist about a prescription

accusing a political opponent of dishonest behavior

publishing a family recipe in a community cookbook

obtaining unauthorized personal information from a website

What the Ninth Amendment focuses on is on rights of humans which are not explicitly listed. While these are not mentioned, this does not mean that these rights should be violated. And the action that would violate this Amendment is obtaining unauthorized personal information from a website. The answer is the last option.