owing statements is not true about the correlation (r) between the weight in pounds and gas mileage in miles-per-gallon for a sample of pickup trucks?…

Which of the following statements is not true about the correlation (r) between the weight in pounds and gas mileage in miles-per-gallon for a sample of pickup trucks? 
A. r must take a value between -1 and 1.
B.r is measured in pounds per gallon.
C.If heavier pickup trucks tend to also get lower gas mileage, then r < 0. 
D.r would not change if we measured these trucks in kilograms instead of pounds

 

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