Three samples of 100 g of water (samples I, II and III), initially kept at 1 atm pressure and 298 K were given the following treatments. Sample I was heated to 320 K and cooled to 298 K.
Sample II was heated to 300 K, cooled to 273 K and heated to 298 K.
Sample III was heated to 373 K and cooled to 298 K.
At the end of these processes, the internal energy of

A

III is the highest

B

II is the highest

C

I and III are the same and II is lower than that of I and III

D

I, II and III are the same