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[单选题]

Robert Lamy is an equity advisor. One day he gathered information about three microeconomic variables X, Y, Z. He noticed that whenever variable X increased by one unit, variable Y decreased by 0.3 units but variable Z increase by 0.3 units. The correlation between variables X and Y and the correlation between variables X and Z, respectively, are closest to:
Correlation between　　　　　Correlation between
Variables X and Y　　　　　　variables X and Z

A.-0.3　　　　　　　　　　　1.0

B.-0.3　　　　　　　　　　　0.3

C.-1.0　　　　　　　　　　　1.0

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