What Type of Solar Heating System Would Be Most Efficient

Multiple Choice

What type of solar heating system would be most efficient at producing high-temperature water for industrial applications or steam to run turbines that generate electricity?

A) fuel cells that directly convert chemical energy into electricity.
B) biomass generators that burn natural materials to generate heat.
C) solar thermal electric generation systems using mirrors or lenses to concentrate sunlight to heat water.
D) passive solar systems that use building design to maximize winter sunlight to heat water.
E) convection solar heating systems that circulate warm air throughout the liquid.