Mark the correct statement concerning the ideas expressed...

A The capacity of producers to find out new energy resources has been decreasing B Renewable energy sources are far more used in the U.S. than nonrenewable ones. C Solar power, hydroelectric and natural gas are instances of renewable energy sources D Biomass and hydroelectricity are the only sources of renewable energy available in the U.S. E To predict the duration of nonrenewable energy sources, a lot of variables must be considered