Which of the following statements is incorrect?

Options

A. A real gas can be liquified, if applied pressure is more than its critical pressure and its temperature is less than its critical temperature
B. The temperature above which a substance can exist in gaseous state only is called as its critical temperature
C. If two gases are having same value of 'b' but different value of 'a', then gas with larger 'a' will occupy more volume under similar conditions
D. real gas obeying van der Waals equation will resemble ideal gas if the constants 'a' and 'b' are very small