The diagram illustrates the separation of petroleum into fractions. What might X, Y and Z stand for?
- AX: diesel oil; Y: lubricating fraction; Z: paraffin
- BX: lubricating fraction; Y: diesel oil; Z: paraffin
- CX: paraffin; Y: lubricating fraction; Z: diesel oil
- DX: paraffin; Y: diesel oil; Z: lubricating fraction