Identify (Z) in the following reaction series `:`
Ethanol `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. `CH_(3)-CH_(2)-O-CH_(2)-CH_(3)`
B. `CH_(3)-CH_(2)-OSO_(3)H`
C. `CH_(3)CH_(2)OH`
D. `CH_(2)=CH_(2)`