Identify the correct statement regarding entropy

Options

A. At `0^@C`, the entropy of a perfectly crystalline substance is taken to be zero.
B. At absolute zero of temperature, the entropy of a perfectly crystal line substance is + ve.
C. At absolute zero of temperature, the antropy of all crystalline substances is taken to be zero.
D. At absolute zero of temperature, the entropy of a perfectly crystal line substance is taken to be zero.

Answer

D