单项选择题

Questions 21 to 22 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions.
What is the main cause for dropping the former EPA standard

A．The danger of premature death.
B．The protest from the smog victims.
C．The disapproval of the White House.
D．The protest from Green Peace groups.
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