Many Fast Food Restaurants, Including Burger King, McDonald's, and Wendy's

Many fast food restaurants, including Burger King, McDonald's, and Wendy's, no longer use Styrofoam containers (which do not degrade as quickly as paper in a landfill) for packaging of their products.Rather, these firms wrap their burgers in recycled paper and place to-go orders in recycled paper bags.These fast-food restaurants use

A) proactive marketing.
B) green marketing.
C) consumerism.
D) an ecological code of ethics.
E) cause marketing.