Explanation:

- Under duress means performing an action because of threat, force, or pressure.

- Option 1: Under pressure - This is the correct meaning. "Under duress" is often used to describe situations where someone feels compelled to act because of force or threats.

- Option 2: Under shelter - This means being protected or shielded. It is not related to "duress."

- Option 3: Under confusions - This means being unclear or uncertain, which is unrelated to "duress."

- Option 4: Under support - This means receiving help or assistance, contrasting with the notion of being forced.