The term "oily mixture", as defined in the Pollution Prevention Regulations (33 CFR) includes __________.

Correct Answer: Option D — all of the above

33 CFR 151.05 defines an oily mixture as a mixture with any oil content. This broad regulatory definition encompasses oily ballast water, bilge slops, and sludge. Compliance with MARPOL Annex I and 33 CFR requires treating all these substances as regulated pollutants to prevent illegal discharge into the marine environment.