Answer:
a. Ethanol fermented from corn.
c. Diesel generated from used cooking oils.
Explanation:
Renewable energy is also known as clean energy and it can be defined as a type of energy that are generated through natural sources or technology-based processes that are replenished constantly. Some examples of these natural sources are water (hydropower), wind (wind energy), sun (solar power), geothermal, biomass, waves, etc.
Basically, a renewable energy source is sustainable and as such can not be exhausted.
Biomass or biofuels which is generally considered to be a renewable energy source would include ethanol fermented from corn and diesel generated from used cooking oils.