From the above compounds, correct the order of reactivity in electrophilic aromatic substitution reactions will be: 
a) Toluene < Chlorobenzene < Nitrobenzene 
b) Nitrobenzene < Chlorobenzene < Toluene 
c) Chlorobenzene < Toluene < Nitrobenzene 
d) Nitrobenzene < Toluene < Chlorobenzene