The given graph represent the variations of compressibility factor $\left(\mathrm{Z}\right)=\frac{\mathrm{pV}}{\mathrm{nRT}}\text{ versus }\mathrm{p}$, for three real gases A, Band C. Identify the only incorrect statement.

• A

  For the gas A, a = 0 and its dependence on p is linear at all pressure

• B

  For the gas B, b = 0 and its dependence on p is linear at all pressure

• C

  For the gas C, which is typical real gas for which neither a nor b = 0. By knowing the minima and point of the intersection, with Z = 1, a and b can be calcuiated

• D

  At high pressure, the slope is positive for all real gases