Which of the following statements correctly identifies the three categories of Noxious Liquid Substances?

• A. They are X, Y, Z
• B. They are A, B, C
• C. They are 1, 2, 3
• D. They are Alpha, Beta, Gamma

Answer: (A)

Noxious Liquid Substances are categorized by hazard into three levels to guide how they are handled and discharged. These levels are labeled X, Y, and Z, with X indicating substances of very high hazard, Y for substantial but somewhat lower hazard, and Z for comparatively lower hazard. This three-tier labeling is the standard used in MARPOL Annex II to determine what discharges are restricted or prohibited and what kind of reception facilities are required.

That’s why the statement listing X, Y, Z is the correct match. The other labelings (A, B, C; 1, 2, 3; Alpha, Beta, Gamma) do not correspond to this regulatory three-category system.