In the past, home heating systems have been operated using different sources of energy such as wood, electricity, and kerosene. But these are expensive when compared to a more recently developed source - solar energy. Solar energy is an alternative, but its application for heating is limited to a small number of appliances. There is also the difficulty of obtaining solar energy for heating purposes in the winter time when it is most needed and its major resource, the sun, is hardly effective.

Question: If electricity were a lot cheaper, we would have no need for solar energy.
Options:
A. true, B. false, C. uncertain
Answer: "C"