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For any Company X listed in the chart above, let ?X be defined as the difference between the mean annual donation of employees of Company X in the period 1980–1990 and that for the same company in the period 1980–2000. Which of the following is closest to the ratio of ?M to ?B?
A.2 to 1
B.3 to 2
C.1 to 1
D.2 to 3
E.1 to 2
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