What Are the Primary Biofuels in Sub-Saharan Africa

What are the primary biofuels in Sub-Saharan Africa?

A) fuels manufactured from food and lawn wastes
B) wood chips that are compacted together into log form and then sold at African markets for heating fuel
C) a new form of synfuel that has been created to solve Sub-Saharan Africa's energy problems
D) wood and charcoal used for household energy needs
E) non-renewable resources such as coal and oil that are used to power industrial operations in African factories