Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : In an insulated container, a gas is adiabatically shrunk to half of its initial volume. The temperature of the gas decreases.
Reason (R): Free expansion of an ideal gas is an irreversible and an adiabatic process.
In the light of the above statements, choose the correct answer from the options given below :

1. A Both \((\mathbf{A})\) and \((\mathbf{R})\) are true but \((\mathbf{R})\) is NOT the correct explanation of \((\mathbf{A})\)
2. B (A) is false but (R) is true
3. C (A) is true but (R) is false
4. D Both \((\mathbf{A})\) and \((\mathbf{R})\) are true and \((\mathbf{R})\) is the correct explanation of \((\mathbf{A})\)