According to 46 CFR, Part 30, a Grade "E" petroleum product is __________.

Correct Answer: Option B — a combustible liquid

46 CFR 30.10-15 defines Grade E petroleum products as combustible liquids, which have a flash point of 150°F or higher. Unlike flammable liquids, which are classified as Grades A, B, or C, combustible liquids present a lower fire risk but still require adherence to specific handling and storage regulations.