The relative rates of hydrogenation is in the order of
A. `CH_(2)=CH_(2) gt RCH = CH_(2) gt RCH = CHR gt R_(2)C = CHR`
B. `R_(2)C = CHR gt RCH = CHR gt RCH = CH_(2) gt CH_(2) = CH_(2)`
C. `RCH = CHR gt R_(2)C = CHR gt RCH = CH_(2) gt CH_(2) = CH_(2)`
D. `R_(2)C = CHR gt CH_(2) = CH_(2) gt RCH = CHR gt RCH = CH_(2)`