Answer:
C. by comparing and contrasting the solar power clean industry to other power sources
Explanation:
Solar power which is one of the effective and efficient method of power is the leading research in energy production, consumption and distribution. In-order to encourage continuous usage, there is need for there to be great investment in the sector.
To achieve this, the author did a comparison between the solar power industry and the non-renewable industries where other power sources are gotten from.