A vessel discharges oily bilge water overboard and introduces a chemical dispersant into the discharge stream to reduce the apparent oil content of the effluent below 15 ppm. Under 33 CFR §151.10, this practice is:

1. ✓ Prohibited, because no discharge into the sea shall contain chemicals or other substances introduced for the purpose of circumventing the discharge conditionsCorrect
2. B. Permitted, provided the resulting effluent oil content is verified to be below 15 ppm by the approved bilge alarm
3. C. Permitted only when the vessel is more than 12 nautical miles from the nearest land and proceeding enroute
4. D. Permitted in all areas except special areas, provided the oily-water separating equipment is in operation