Interconversion of states can be brought about by
changing the pressure and temperature
The explanation for the correct option:
(D) changing the pressure and temperature: Interconversion of states of matter involves the change in temperature and pressure in conditions like heating and freezing,cooling. States can be interconverted by changing the extent of the intermolecular forces that happen by changing pressure and temperature only.
The explanation for the incorrect option:
(A) Adding water: Adding water does not change the state of matter. So, option A is incorrect.
(B) Changing the container: Changing the container does not change the state of matter. So, option B is incorrect.
(C) Taking a greater mass of a substance: By taking grater amount of substance does not change the extent of intermolecular forces. So, option C is also incorrect.
Hence, the correct option is D. i.e., Interconversion of states of matter involves the change in temperature and pressure.