$\begin{array}{1 1}(A)\;P_A\text{ must be equal to }P_B\\(B)\;P_A\text{ must be greater than }P_B\\(C)\;P_A\text{ must be smaller than }P_B\\(D)\;P_A=P_B\text{ only if the cross sectional area of A and B are equal}\end{array} $

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