I think the answer is C. I think so beacuse "vast meaning of usefullness" means that life is too short for all the useful things to get done.
Answer:
Earth day is an even that increases the awareness of the world's environmental issues.
Explanation: Earth day is celebrated in the United States for the first time on April 22, 1970. Millions of American people participated in this celebration. This includes, thousands of students from many different colleges and universities. They all participated in rallies, marches and my different educational programs across the country.