The correct order of rate of addition of Br₂/ water to the following alkenes is
$\begin{array}{l}C{H}_2=C{H}_{2}C{H}_2=CH-N{O}_2\\ \left[A\right]\left[B\right]\end{array}$

D has 2 alkyl groups, C has one and A has none, but the B has a  electron with drawing nitro group.  So, higher the stability of 
 bromonium ion formed higher be the rate of bromination reaction. So the correct order of rate of  reaction is $D>C>A>B$