Answer:
Department of Energy statistics indicates that clean energy is generating hundreds of billions in economic activity, and it is expected to grow further in the years ahead. Clean energy is renewable, and it does not contribute to global warming or the greenhouse effect.
Therefore, I would invest all the money in renewable, clean energy. This would include solar energy and wind energy in the options given. Oil, coal, and gas are damaging pollutants, regardless of how they are produced or used. Another renewable energy source I would consider is geothermal energy, as well as water and biomass.