Answer:
Diagnosing disease.
Step-by-step explanation:
Public health may be defined as the art and the science used for the disease prevention. This promotes the human health through different organization efforts may be public and private.
The public health awareness can be increased by educating the people about the harmful effects of the disease and free vaccination. By providing proper water and sanitary conditions to the people. The diagnosing disease is a step taken if an individual is already affected by the disease.
Thus, the correct answer is option (b).