Which methods are described for making potable water safe to drink?

• A. Filtration Only
• B. Freezing and Drying
• C. Boiling, Chlorination, Distillation
• D. Boiling and Filtering

Answer: (C)

Making water safe to drink relies on using multiple barriers to remove or neutralize hazards. Boiling kills pathogens by heat, chlorination adds a chemical disinfectant that helps protect against microbes, and distillation removes dissolved contaminants by turning water into vapor and then condensing it back. Together, these methods address a wide range of dangers: heat handles microbes, chlorine provides ongoing disinfection, and distillation clears dissolved substances like salts and metals.

The other options don’t provide comprehensive protection. Filtration alone may remove particulates and some microorganisms, but not all microbes or dissolved chemicals. Freezing and drying don’t reliably kill or remove pathogens or contaminants. Boiling with filtering covers disinfection and some particulates but still may miss dissolved contaminants that distillation can remove.