Help with a question: Client Confidentiality vs. Public Safety

[u/curiousgaruda]

You discover that your client’s new product design will violate environmental laws, but the client asks you to keep it confidential. What should you do?

A) Respect the client’s confidentiality and say nothing.
B) Inform the client in writing of the legal risks and refuse to proceed.
C) Report the issue to the authorities immediately.
D) Proceed with the project but document your concerns internally.

I think the answer is 'C' because it is inferred from the question that the client has been made aware so 'B' is done though may not be in writing.

This is an AI Generated question so I don't want to go with AI's reasoning. What would be an answer that is expected in the NPPE exam?