Which combination can be used to create a fumigant?

The correct choice involves the combination of Borax and formalin to create a fumigant because this specific mixture can release formaldehyde gas, which is an effective fumigating agent. Fumigants are substances that can be vaporized or can produce vapors that are toxic to pests or pathogens. Formaldehyde is recognized for its ability to kill bacteria, mold, and other microorganisms, making it suitable for disinfection and pest control in enclosed spaces.

The other combinations do not produce effective fumigants suitable for disinfection. Chlorine and water create a bleach solution, which could disinfect surfaces but is not effectively used as a fumigant. Bleach and vinegar produce chlorine gas, which is hazardous and not intended for fumigation purposes. Hydrogen peroxide and alcohol may have some disinfecting properties, but the combination does not yield effective fumigating capabilities. Therefore, Borax and formalin are uniquely qualified for this purpose.