Compounds X and Y are combined, and a small quantity of concentrated $\text{H}_2\text{SO}_4$ is then added. In the product mixture formed, ester Z is detected. Which pair of compounds might X and Y be?
- AX: $\text{CH}_3\text{CH}_2\text{OH}$; Y: $\text{CH(CO}_2\text{H)}_3$
- BX: $\text{CH}_3\text{CH}_2\text{OH}$; Y: $\text{CH}_3\text{CO}_2\text{CH}_2\text{CH(OH)CH}_2\text{OCOCH}_2\text{CH}_3$
- CX: $\text{CH}_3\text{CO}_2\text{H}$; Y: $\text{CH}_3\text{CH}_2\text{CO}_2\text{CH}_2\text{CH(OH)CH}_2\text{OH}$
- DX: $\text{CH}_3\text{CO}_2\text{H}$; Y: $\text{CH}_2(\text{OH)CH(OH)CH}_2\text{(OH)}$