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# According to third law of thermodynamics, the entropy at 0 K is zero for

(a) elements in their stable form
(b) perfectly crystalline solids
(c) substances at 1 atm and $25^\circ C$
(d) $N_2O$

For perfectly crystalline solids at 0 K, all molecular motion ceases and particles are closely packed. Thus, randomness and hence entropy is minimum.