Explanation:

According to the World Health Organization (WHO), a healthy city must encompass several key characteristics to ensure the well-being of its inhabitants. Among the options listed:

A clean and safe environment is essential for a healthy city. It includes factors like clean air, safe drinking water, and safe streets and buildings.

Meeting the basic needs of all its inhabitants is crucial. This includes adequate nutrition, shelter, and access to essential services.

Involving the community in local government is an important aspect of a healthy city. Community participation ensures that the needs and preferences of the residents are taken into account in urban planning and decision-making.

Providing easily accessible health services is fundamental for a healthy city. This ensures that all residents have access to medical care and health-related information.

Therefore, all four of the listed elements are important components of a healthy city according to WHO.