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

Correct Answer: Option A — U.S. Vessels 26 feet or more in length

33 CFR 155.450 mandates that all U.S. vessels 26 feet or more in length must display a "Discharge of Oil Prohibited" placard. This requirement serves as a clear, permanent warning to crew members regarding the legal prohibitions against discharging oil into the navigable waters of the United States.