The correct statement regarding entropy is,

• Correct answer
  A

  At absolute zero temperature, entropy of a perfectly crystalline solid is zero.
• B

  At absolute zero temperature, the entropy of a perfectly crystalline substance is \( +V e \).
• C

  At absolute zero temperature, the entropy of all crystalline substances is zero.
• D

  At \( 0{ }^{\circ} \mathrm{C} \), the entropy of a perfect crystalline solid is zero.

Hence, the correct answer is option: 'A'.