Which process produces the energy that is used by solar panels? O A. Nuclear fusion
O B. Combustion
O C. Chemical decay
D. Nuclear decay

While unproven, it uses facts to support part of a conclusion. it is still factual and has predictive power, however.

What are the options? physical property can be color, smell, opacity, viscosity, density, infra red spectrum, melting and boiling points, attraction and repulson to magnets, etc.