It's probably c because I think it is
Answer:
It is the most important because people are very important to the development of the country.
Explanation:
People are doing the work. We need the people to work at stores, build, mine, etc. The people of today are the ones that are building the industry making it a better place to live in. People are also important for the research, development, and engineering.
it wont let me post it so i'll comment on the question box