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