The given graph / data I, II, III and IV represent general trends observed for different physisorption and chemisorption processes under mild conditions of temperature and pressure. Which of the following choice (s) about I, II, III and IV is (are) correct

A

I is physisorption and II is chemisorption

B

I is physisorption and III is chemisorption

C

IV is chemisorption and II is chemisorption

D

IV is chemisorption and III is chemisorption