Among the following, which are extensive variables?

If the enthalpy of $B$ is greater than that of $A$,the reaction $A \to B$ is

Which of the following are extensive properties?
$(A)$ Heat capacity
$(B)$ Entropy
$(C)$ Gibbs' energy
$(D)$ Concentration
$(E)$ Vapour pressure

Fill in the blanks:
$(i)$ During the ........... process,there is no absorption or evolution of heat.
$(ii)$ The equation $\Delta G = \Delta H - T\Delta S$ was proposed by ........... .

For the isothermal reversible expansion of an ideal gas,which of the following is correct?

Given below are two statements $ : $
Statement $I :$ When a system containing ice in equilibrium with water $(\text{liquid})$ is heated, heat is absorbed by the system and there is no change in the temperature of the system until whole ice gets melted.
Statement $II :$ At the melting point of ice, there is absorption of heat in order to overcome intermolecular forces of attraction within the molecules of water in ice, and the kinetic energy of molecules is not increased at the melting point.
In the light of the above statements, choose the correct answer from the options given below $ : $