6. What can you conclude from the fact that lots of research is being done into wind and solar energy? a. In the future, these technologies may be far more sophisticated and efficient
b. We don't really know how solar and wind energy can be used to produce electricity
c. These technologies are too complicated to be widely used
d. These technologies will someday be more expensive​

a. In the future, these technologies may be far more sophisticated and efficient

b. We don't really know how solar and wind energy can be used to produce electricity

Explanation:

The above was able to give a true reason on why there  has been increase in the researches being carried out regarding to wind and solar energy. To the researchers, the sophistication of the technologies as well as not having the knowledge of how to produce electricity with both technologies are part of the drives towards those number of researches.