Healthy Communities and Cities is based on which of the following premises?

Healthy Communities and Cities is based on which of the following premises?
 
  a. When people have the opportunity to work out their own locally defined health problems, they will find sustainable solu-tions to those problems.
  b. When the health of a community is im-proved, the focus will be on life expec-tancy rather than quality of life.
  c. When health professionals assume a lead-ership role, the health of the community will improve.
  d. When cities recruit enough health profes-sionals to care for those needing medical care, the cities health will improve.