According to U.S. regulations, which of the following does not qualify as a discharge of oil?

Correct Answer: Option A — Discharging oil into the sea for pollution research.

33 CFR 151.05 defines a discharge as any release, however caused, from a vessel. However, authorized discharges for scientific research or pollution control, when conducted under specific regulatory permits or government oversight, are legally excluded from the definition of prohibited oil discharges under the Clean Water Act.