What is the maximum volume of flammable liquid allowed in an open container?

The correct answer is based on safety regulations concerning the handling of flammable liquids, particularly in laboratory settings. The guideline that limits the volume of flammable liquids in open containers is rooted in minimizing the risk of accidents such as spills or fires.

In this context, allowing a maximum of 0.1 pint in an open container is a precautionary measure. It ensures that if the liquid were to ignite or spill, the volume is small enough to manage effectively and reduces the potential for a hazardous situation.

In laboratory environments, strict adherence to these limits is crucial, as flammable liquids can easily form vapors that may ignite. Therefore, the regulations have established the maximum volume to effectively control the risks associated with flammable materials, making it critical for lab safety protocols.

The other choices present larger volumes that do not align with the safety standards designed to limit hazards associated with flammable substances.