Critical Reasoning (CR) | Re: Unlike the more traditional energy sources of coal

Unlike the more traditional energy sources of coal, gas, and nuclear energy, energy from the sun produces no major problems. It produces no pollution and requires no transportation from foreign lands. It threatens no one with radiation dangers and is not controlled by powerful corporations. Therefore, we should encourage people to use solar energy.

Which of the following statements, if true, most seriously weakens this argument?

(A) There have been very few studies of solar energy use by households