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单项选择题

A.complain about public ignorance of its efforts to imp……

The President of Association of American railroads wrote the letter to

A.complain about public ignorance of its efforts to improve the service.
B.criticize U. S. News for not reporting its efforts to improve the safety record.
C.inform the public of what it has achieved over the past decade.
D.thank U. S. News for informing the public of its efforts to reduce accident rate.