The ASET Code of Ethics mandates that members hold paramount the safety, health, and welfare of the public and the protection of the environment. Discovering the illegal dumping of toxic substances is a severe issue that a professional cannot ignore (Option C), as it directly violates this paramount duty. However, professional protocol dictates a specific chain of escalation. A single technologist generally does not have the resources, authority, or specialized training to safely "clean up" toxic waste on their own (Option A), which could cause further harm. While reporting to an external environmental regulator (whistleblowing) is required if the company refuses to act (Option B), the ethical first step is to report the situation internally to the appropriate person in the organization, such as a direct supervisor, the environmental compliance officer, or upper management. This fulfills the duty of fidelity to the employer by giving the company the immediate opportunity to halt the illegal activity, initiate emergency response protocols, and self-report to the authorities as required by environmental law.