When compound Z is warmed with concentrated acidified potassium manganate(VII), an equimolar mixture of $\text{CO}_2$ and $\text{CH}_3\text{COCH}_2\text{CH}_2\text{CH}($\text{COCH}_3$)\text{CH}_2\text{CO}_2\text{H}$ is produced. What might the structural formula of Z be?
- A1, 2 and 3
- B1 and 2 only
- C2 and 3 only
- D1 only