Arrange the following compounds in increasing order of reactivity towards the addition of HBr
`RCH=CHR,overset(CH_(2))overset(||)(CH_(2)),R_(2)C=CHR,R_(2)C=CR_(2)`
A. `underset(CH_(2))overset(CH_(2))(||)ltRCH=CHRltR_(2)C=CHRltR_(2)C=CR_(2)`
B. `R_(2)C=CHRltRCH=CHRltCH_(2)=CR_(2)ltR_(2)C=CR_(2)`
C. `R_(2)C=CR_(2)ltR_(2)C=CHRltRCH=CHRltCH_(2)=CH_(2)`
D. `R_(2)C=CR_(2)ltCH_(2)=CH_(3)ltRCH=CHRltR_(2)C=CHR`