Which of the following is not an acceptable unit of measure to be used consistently throughout an Oil Record Book?

Correct Answer: Option A — tons

MARPOL Annex I and 33 CFR 151.25 require the Oil Record Book to use standardized units of volume, specifically cubic meters. Tons are a measure of mass, which varies with oil density and temperature, making them unsuitable for the precise volumetric accounting required for pollution prevention compliance.