The Gibbs free energy G for a liquid is considered as a function of temperature $(\mathrm{T})$ and pressure $(\mathrm{P}) . \mathrm{G}$ is plotted either as a function of temperature at different constant pressures $P_1$ and $P_2\left(P_2>P_1\right)$ or as a function of pressure at different constant temperatures $T_1$ and $T_2\left(T_2>T_1\right)$. The correct variation of $G$ is best represented as

• Correct answer
  A

  
  
• B

  
  
• C

  
  
• D

  
  

Hence, the correct answer is option: 'A'.