At low pressure,Vander Waals equation is written as $(P + \frac{a}{V^2})V = RT$. The compressibility factor is then equal to
- A$(1 - \frac{a}{RTV})$
- B$(1 - \frac{RTV}{a})$
- C$(1 + \frac{a}{RTV})$
- D$(1 + \frac{RTV}{a})$
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