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单项选择题

Early last month, Bill Gates released a video of a venture funded by the Gates Foundation: the Omniprocessor, a Seattle-based processing plant that bums sewage (污水) to make clean drinking water. In the video, Gates raises a glass of water to his lips. Just five minutes ago, he explains, that water was human waste. Gates takes a sip (小口呷）). “It’s water, ’’ he says. “Having studied the engineering behind it, I would happily drink it every day. It’s that safe.” According to the Foundation^ estimates, at least two billion people lack access to proper sanitation (公共卫生);a report warned that, within the next decade, “many countries will experience water problems—shortages, poor water quality, or floods—that will risk instability and state failure.” The Omniprocessor’s approach seems to be the perfect solution. It offers clean drinking water where access is lacking. In fact, the technology has been around for years, and its effectiveness is an established fact So why hasn’t it been widely adopted yet That’s precisely the question that Paul Rozin tackled in a series of studies spanning over 2,000 American adults and several hundred college students. The results were published in the journal Judgment and Decision Making. “The problem isn’t making the recycled water but getting people to drink it,” Rozin said. “And it’s a problem that isn’t going to be solved by engineers. It will be solved by psychologists.”

The video shows that Bill Gates is ______.
A．explaining the water recycling process
B．making water out of sewage
C．drinking clean water made from sewage
D．risking drinking polluted water
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