Four 1.0 L samples are prepared at 298 K, each containing a different substance under the phase indicated.
I. Argon gas at 1.0 atm
II. Water (liquid)
III. Mercury (liquid)
IV. Sodium metal (solid)
Which of the following orders the samples from most easily compressed to least easily compressed?
a) I > IV > II > III
b) II > I > III > IV
c) I > II > III > IV
d) I > III > II > IV