1) Sua loi va giai thich: a) Because of urbanization continues, not only the infrastructure for health but also other social services in cities need improving

Addressing the challenges of urbanization requires investments in improving infrastructure and services in cities.

Improving infrastructure for health and social services is crucial to meet the needs of urban populations.

Infrastructure for health and social services may not be able to keep up with the rapid urbanization.

The demand for health services and other social services also increases with the growing population.

Urbanization leads to an increase in population density in cities.