Which of the following accurately describes a trade-off of using biomass as a fuel?
a. it is easy to produce biomass, but burning it as a fuel generates radioactive waste.
b. it is cheap to produce biomass, but it is a nonrenewable resource.
c. burning biomass produces no air or water pollution, but it is expensive to collect the necessary materials.
d. the living things used to produce biomass are plentiful and grow quickly, but burning biomass generates air pollution.
