Static charges can build up in which of the following types of matter?

Static charges can build up in gases and vapors due to the movement of charged particles when they are in close proximity or interact with other materials. This phenomenon occurs as a result of friction, contact, or separation of materials, which can cause electrons to be transferred from one surface to another.

In gases, while the molecules are loosely held and can move freely, they can still gain or lose electrons through interactions with other particles or surfaces that they come into contact with. It's important to recognize that static electricity does not only occur in solids or liquids; it can also manifest in gaseous states, making the understanding of charge buildup essential for safety in various environments.

Other materials, such as liquids, solids, or specific particles like dust, can also accumulate static charges, but the key to the correct option lies in recognizing that gases and vapors are indeed capable of developing static electricity under the right conditions. This illustrates the importance of considering all states of matter when evaluating electrical safety and the potential for static discharge hazards.