I would say a because he ran too much but that would be just me I think he hurt his knee from running too much more exercise but probably just aggravate his condition I could be wrong but this is what I think
D is the answer for your question
The practice aimed at stabilizing the world population in which each couple has no more than two children is known as zero population growth
A population is the entire set of people in a group, whether that group is a country or a collection of people who share a certain trait. A population is the group of people from which a statistical sample is taken in statistics.
A population is the total number of individuals who cohabit a certain area. The population of a city is the total number of inhabitants. They are referred to as residents or occupants. The population consists of everyone who resides in the region.
The population should be in balance with available resources and means as one of the key aspects in maintaining a healthy ecosystem.
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