Question 723 Deck General

The correct answer is D) Red. Flammable liquids must be labeled with a red diamond-shaped placard or label, as per the hazardous materials regulations enforced by the US Coast Guard. This is to clearly identify the flammable nature of the substance and the associated fire hazards. The red color is a universal standard for flammable materials, making it the appropriate choice compared to the other options which do not accurately represent the hazard.