For what is solar thermal energy most often used?

a. heating homes

b. generating electricity

c. providing light

Solar thermal technology uses the sun's energy, rather than fossil fuels, to generate low-cost, environmentally friendly thermal energy. This energy is used to heat water or other fluids, and can also power solar cooling systems.

While solar energy is used to do all of these, since this question specifically focuses on solar thermal energy, i believe that the answer is either A or B