Under 33 CFR §151.05, 'oil residue (sludge)' is defined as residual waste oil products generated during normal ship operations. Which of the following is an example specifically included in that definition?

Why C is correct

33 CFR §151.05 defines oil residue (sludge) as residual waste oil products from normal ship operations, including waste oil from purification of fuel or lubricating oil, separated waste oil from filtering equipment, waste oil from drip trays, and waste hydraulic and lubricating oils. Oily ballast and cargo pump room bilge slops are components of 'oily mixture,' not sludge.