Answer: The correct answer is option C.
Step-by-step explanation:
Death rate refers to the number of deaths take place in a specific area during a specific time. It is usually calculated as number of death per 1000 individuals per year.
Increase in food availability, advancement in diagnosis and medicines, safe drinking water, education, high standards of living, et cetera help in increasing the life expectancy of people and thus, help in decreasing the death rate.
In contrast, contraceptives are the methods used to prevent unwanted pregnancy. It helps in family planning and controlling the population. However, it does not play any direct role in decreasing death rate.