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 of gas inside the vessel and increase in volume.
(a)If both (A) and (R)are true and (R) is the true explanation of (A).
(b) If both (A) and (R)are true but (R) is not the true explanation of (A).
(c ) If (A) is true but (R) is false.
(d) If both (A) and (R) is false