Which of the flash points would indicate a grade D combustible liquid?

Correct Answer: Option C — 87°F

Per 46 CFR 30.10-22, Grade D combustible liquids have a flash point above 80°F and at or below 150°F. An 87°F flash point falls squarely within this range, distinguishing it from Grade C (80°F or below) and Grade E (above 150°F) products for regulatory and safety purposes.