$\beta$-carotene gives carrots their orange colour. $\beta$-carotene is oxidised by hot, concentrated, acidified $\text{KMnO}_4$. If one molecule of $\beta$-carotene is oxidised in this manner, a large number of product molecules are produced. How many of these product molecules contain a ketone functional group?
- A4
- B6
- C9
- D11