Waste Management Ran an Advertisement That Told the Story of How

Waste Management ran an advertisement that told the story of how it managed some of the waste it collected. The headline was "We've been known to send some people's garbage right back to their house." The copy explained that Waste Management collects clean burning methane gas from one of its landfills. The gas is used to fuel the turbines that run power generators that provide electricity for homes. This is an example of

A) corporate image advertising.
B) product advertising.
C) public relations.
D) cause-related advertising.