Answer:
c.Corporate social responsibility (CSR)
Explanation:
Based on the information provided within the question it can be said that Greensaver Corp's efforts are best described as Corporate social responsibility. This refers to the act of a company' charitable nature to contribute to societal goals. Which is exactly what Greensaver Corp is doing by installing saplings in parks and roadsides in order to combat pollution of nonrenewable resources for the good of the planet and society.