Assertion (A): When a gas at high pressure expands against vacuum, the work done is maximum.
Reason (R ) : Work done in expansion depends upon the pressure inside the gas and increase in volume.

Options

A. If both (A) and (R ) are correct, and (R ) is the correct explanation for (A).
B. If the both (A) and (R ) are correct, but(R ) is not a correct explanation for (A).
C. If (A) is correct, but (R ) is incorrect.
D. If both (A) and (R ) are incorrect.