The correct answer is B) in a metal container with a tight cap. This is the correct answer because small quantities of flammable liquids should be stored in a metal container with a tight cap for safety. This helps prevent accidental spills or vapors from being released, which could create a fire hazard. The metal container provides a secure and fire-resistant storage solution for these types of hazardous materials at the work site. The other answer choices are not as appropriate. Option A is less secure, as the flammable liquids may not be as tightly contained. Option C requires additional equipment that may not always be practical or available. Option D adds an unnecessary restriction, as small quantities can be safely handled by workers without direct supervision.