Final answer:
Nexar Energy is employing a strategy of advocacy, advocating for the use of solar power to replace petroleum-based energy sources.
Step-by-step explanation:
The strategy that Nexar Energy is employing is known as advocacy. They are deliberately attempting to change the way we do things with respect to energy sources by advocating for the use of solar power to replace all petroleum-based energy sources. Through demonstrations, they showcase how solar power can be used in automobiles, power sources, and heating and cooling, encouraging the adoption of solar energy.
Learn more about Nexar Energy's strategy