According to Pollution Prevention Regulations (33 CFR), the "Discharge of Oil Prohibited" placard is required on all __________.

Correct Answer: Option B — U.S. vessels 26 feet or more in length

33 CFR 155.450 requires a "Discharge of Oil Prohibited" placard to be displayed on all U.S. vessels 26 feet or more in length. This placard must be posted in machinery spaces or at the bilge pump control station to warn crew members of legal prohibitions against oil pollution.