The correct answer is [B] Isothermal change

• The boiling process represents an isothermal process.
• An isothermal process is a thermodynamic process during which the temperature of a system remains constant. In the case of boiling, the temperature of the liquid remains constant as it is converted to a gas.
• An adiabatic process is a thermodynamic process during which no heat is exchanged with the surroundings.
• The isochoric process is a thermodynamic process in which the volume of the system remains constant.

Additional Information

1.  Adiabatic change: An adiabatic change is a thermodynamic process in which no heat is exchanged between the system and its surroundings. During an adiabatic change, the internal energy of the system may change due to work done on or by the system, but the temperature of the system will remain constant.
2. Isothermal change: An isothermal process is a thermodynamic process during which the temperature of a system remains constant. In the case of boiling, the temperature of the liquid remains constant as it is converted to a gas.
3. Isochoric process: An isochoric process is a thermodynamic process in which the volume of the system remains constant. During an isochoric process, the internal energy of the system may change due to work done on or by the system or due to heat transfer, but the volume of the system will remain constant.
4. None of the above: This option indicates that none of the above options correctly describe the boiling process.

Therefore, the correct option is [B] Isothermal change.