According to the article, why did Favio Chávez and Nicolás Gómez start making musical instruments from trash?

According to the article, why did Favio Chávez and Nicolás Gómez start making musical instruments from trash?
A. There were many more young people interested in creating instruments than actually playing music with them.
B. They wanted to help both their community and the environment by reducing the size of a local landfill.
C. They wanted to help recyclers increase their profits from objects and materials found in the landfill.
D. There were too few affordable instruments to meet the needs of the many young people who wanted to play.