In the reaction sequence
`CH_(2)=CH_(2) overset("hydrochlorous")underset("acid")rarr A overset(R)rarr overset(CH_(2)OH)underset(CH_(2)OH)("| ")`
`A` and `R` are respectively
A.
B. `CH_(3)CH_(2)Cl and NaOH`
C. `CH_(3)CH_(2)OH and H_(2)SO_(4)`
D. `CH_(2)ClCH_(2)OH and NaHCO_(3)`