For the below graph which of the following combination is correct, (n represents mole and P represent pressure)
(I) If n is constant throughout then P at 2nd point must be greater than at 1st point.
(II) If n is doubled in moving from 1st point to 2nd point then P also doubles in the process.
(III) If n is constant then P is maximum at point (1).

Options

A. I is true
B. II is true
C. Both II and III are true
D. I, II and III all are correct

Answer

A