Step 1: Understand extensive properties.
Extensive properties are those properties whose values depend upon the amount of matter present in the system.
If the size or quantity of the system is doubled, the value of an extensive property also doubles.
Examples include:
Mass, Volume, Heat Capacity, Entropy, Gibbs Energy
Step 2: Analyze Heat Capacity (A).
Heat capacity is the amount of heat required to raise the temperature of the whole system by \(1^\circ C\) or \(1\,K\).
Since heat capacity increases with the amount of substance present,
Heat Capacity
is an extensive property.
Step 3: Analyze Entropy (B).
Entropy is a measure of randomness of a system.
The total entropy of a system depends on the amount of matter present.
Therefore,
Entropy
is an extensive property.
Step 4: Analyze Gibbs Energy (C).
Gibbs free energy is given by
\[
G=H-TS
\]
Since both enthalpy \((H)\) and entropy \((S)\) are extensive quantities,
\[
G
\]
also depends on the amount of substance.
Therefore,
Gibbs Energy
is an extensive property.
Step 5: Analyze Concentration (D).
Concentration is defined as amount of solute per unit volume of solution.
It is independent of the size of the system.
If both solute and solution volume are doubled, concentration remains unchanged.
Hence,
Concentration
is an intensive property.
Step 6: Analyze Vapour Pressure (E).
Vapour pressure depends only on the nature of the liquid and temperature.
It does not depend on the amount of liquid present.
Therefore,
Vapour Pressure
is an intensive property.
Step 7: Final conclusion.
The extensive properties among the given quantities are
Heat Capacity, Entropy and Gibbs Energy
Hence,
\[
\boxed{\text{A, B, C only}}
\]
and the correct option is
\[
\boxed{(3)}
\]