An individual's system of maintaining cleanliness and health is known as:

• A. Nutrition
• B. Public Hygiene
• C. Public Sanitation
• D. Personal Hygiene

Answer: (D)

The main idea here is personal hygiene—the set of daily practices a person uses to keep their body clean and healthy. By regularly washing hands, bathing, brushing and flossing teeth, grooming nails, and maintaining overall cleanliness, individuals reduce the spread of germs and the risk of illness.

Nutrition is about what you eat and how it supports your body’s needs. Public hygiene focuses on hygiene measures at the community or population level, such as sanitation standards and disease prevention in public spaces. Public sanitation deals with infrastructure like waste management and clean water systems. These are important, but they describe broader or different scopes than the individual’s own routines, which is why personal hygiene is the correct choice.