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___ he did it remains a secret.            

A. What       B. Whom       C. Which       D. How

___ he did it remains a secret.            

A. What       B. Whom       C. Which       D. How

___ he did it remains a secret.            

A. What       B. Whom       C. Which       D. How

___ he did it remains a secret.            

A. What       B. Whom       C. Which       D. How

___ he did it remains a secret.            

A. What       B. Whom       C. Which       D. How