Question

Solar energy is: expensive renewable inefficient during winter all of the above

Answer 1

Solar energy is free and renewable.

Its efficiency is determined by the photovoltaic or heat-exchanging equipment used, and the efficiency of the infrastructure built to interconnect them. None of that depends on the time of the year. For a given amount of solar energy absorbed by the collector, the amount of useful output energy doesn't change with the season.

Answer 2

All of the above is the right answer for Odesseyware.