The diagram illustrates the structure of progesterone. Which of the following statements about progesterone is correct?
- AOne molecule contains four chiral carbon atoms only; the molecular formula is $\text{C}_{19}\text{H}_{26}\text{O}_2$.
- BOne molecule contains four chiral carbon atoms only; the molecular formula is $\text{C}_{21}\text{H}_{30}\text{O}_2$.
- COne molecule contains six chiral carbon atoms; the molecular formula is $\text{C}_{19}\text{H}_{26}\text{O}_2$.
- DOne molecule contains six chiral carbon atoms; the molecular formula is $\text{C}_{21}\text{H}_{30}\text{O}_2$.