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

A grade D combustible liquid is defined as having a flash point between 100°F (37.8°C) and 140°F (60°C). Therefore, a liquid with a flash point of 87°F falls outside this grade, as it has a flash point lower than the minimum requirement for a grade D classification.

The correct flash point for a grade D combustible liquid must be at least 100°F, which is the minimum threshold for this grade. This threshold indicates that the substance requires a specific level of heat to ignite and shows that it is more stable and less dangerous than liquids with lower flash points.

In this case, the flash points of 200°F and 150°F indicate higher classifications of combustible liquids as their flash points exceed the grade D range, further confirming that they do not meet the criteria for grade D. Thus, while an option might suggest a lower flash point, it is not relevant to your question regarding grade D classifications.