Identify (Z) int eh following reaction series `:`
Etahanol `overset(PCl_(5))(rarr)(X)overset("Alc. KOH")(rarr)(Y) underset(H_(2)O,"heat") overset(H_(2)SO_(4),"r o om temp.)(rarr)(Z)`
A. `H_(2)C=CH_(2)`
B. `CH_(3)CH_(2)OH`
C. `CH_(3)CH_(2)OSO_(3)H`
D. `C_(2)H_(5)OC_(2)H_(5)`