Each year, the U.S. Army shoots an estimated 200 million rounds of lead bullets at target practice areas across the United States. Pentagon officials, in response to environmentalists' concerns over lead poisoning in the soil, have invested over $12 million to develop an environmentally safe tungsten bullet. This is an example of one of the outcomes of:________.
a. marketing ethics.
b. consumerism.
c. cause marketing.
d. self-regulation.
e. naderism.