The correct answer is A. Public health improvements have contributed to world population growth.
Step-by-step explanation
Public health is a discipline that is responsible for studying issues related to health improvement, disease control, and elimination. For this reason, it has been a determining factor for population growth in the last decades this can be explained as in previous centuries health services and disease control conditions were more limited due to the lack of study in these fields but today, there are instruments such as microscopes, tests, exams, among others to control and eliminate diseases. Also, the health conditions are more rigorous which reduces death rate and support population growth. So, the correct answer is A. Public health improvements have contributed to world population growth.