The given figure shows different arrangements of particles of an unknown substance undergoing changes I, II, III and IV.
Fill in the blanks by choosing an appropriate option. The change(s) (p) involve(s) absorption of heat while change(s) (q) involve(s) evolution of heat. In all these changes, (r) of the substance remains constant.
|A||I, II||III, IV||Volume|
|B||III||I, II, IV||Mass|
|C||I, II, IV||III||Mass|
|D||I, II, IV||III||Energy|