Statement-1: $\sim(p \leftrightarrow \sim q)$ is equivalent to $p \leftrightarrow q$. Statement-2 : $\sim(p \leftrightarrow \sim q)$ is a tautology.

• A

  Statement-1 is true, Statement-2 is true; Statement-2 is a correct explanation for Statement-1
• B

  Statement-1 is true, Statement-2 is true; Statement-2 is not a correct explanation for Statement-1
• Correct answer
  C

  Statement-1 is true, Statement-2 is false
• D

  Statement-1 is false, Statement-2 is true

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