Answer the following question: Fact 1: Biofuel is used to produce electricity by burning. Fact 2: Any green plant can be considered for use in the production of biofuel or bioenergy. Given the two facts above, what can a plant be used to produce when it's burned?

Available choices:
a). toxins.
b). energy.
c). sun's heat.
d). carbon dioxide.
e). kinetic energy.
f). heat energy.
g). adding heat.
h). Electricity.
Answer:
h).