The reaction conditions leading to the best yield of `C_(2)H_(5)Cl` are
A. `C_(2)H_(6)("excess")+ cl_(2) overset("UV light")rarr`
B. `C_(2)H_(6)+ cl_(2)("excess")underset("room temp." )overset("dark ")rarr`
C. `C_(2)H_(6) +Cl_(2)("excess") overset("UV light")rarr`
D. `C_(2)H_(6) +Cl_(2) overset("UV light")rarr`
