A primary alcohol, `C_(3)H_(8)O(W)` on heating with sulphuric acid undergoes dehydration to give an alkene , (X), which reacts with HCl to give (Y). (Y) on treatment with aqueous KOH gives compound (Z),`C_(3)H_(8)O`. Compounds (W) and (Z) are `:`
A. functional isomers
B. position isomers
C. chain isomers
D. stereoisomers
