Santonin is a drug that was formerly used extensively to remove parasitic worms from the body. If santonin is first reacted with warm dilute $\text{H}_2\text{SO}_4$, and the resulting product is then treated with cold acidified $\text{KMnO}_4$, product X is formed. How many hydrogen atoms in each molecule of product X are capable of being displaced by sodium metal?
- A2
- B4
- C5
- D6