TBR Viscosity problem

[womenlover]

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In calibrating a flow meter, an engineer measures the total pressure drop across a pipe as a function of the has flow velocity. Which of the following plots best details his results?

I have attached the document which contains the same question and the choices.

I know that the velocity v is directly proportional to the pressure difference. That eliminates C & D.

But I cannot understand why B is the answer.

 

[sjrobinson]

So velocity is DIRECTLY proportional to pressure difference??

Think about what happens if dP is negative. Should gas be flowing? Check out that y-axis and then you should get it.