An increase in the money supply is correlated to
a. a decrease in real output
b. an increase in aggregate demand
c. an increase in real interest rates

You forgot to add the possibilities. we don't know the options from which to choose.

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Hypothesis: volumes of both figures are equal.the volume of  figure 1 is: .the volume of figure 2 is: .since , you can conclude that and . so, .volumes of figures are equal only when an angle in the basis is right (then figures will be the same), in another cases volume of figure 1 is less than volume of figure 2.the hypothesis was not correct in all cases.

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