Gibbs free energy of a pure fluid approaches __________ as the pressure tends to zero at constant temperature.

Answer: Option B

We know : $$G=G^{\circ }+RTln\frac{f}{P^{\circ }}$$
$$\Rightarrow$$ where $$G^{\circ }$$ and $$P^{\circ }$$ are at standard states
So, we can say when $$P^{\circ }\to 0,\Rightarrow G^{\circ }\to \infty$$