Which of the following represents decreasing order of reactivity of given organic compounds towards nitration?
terepthalic acid, toluene, p-toluic acid, p-xylene, m-xylene
I II III IV V
(A) IV>V > II > III >I
(B) I>II> III > V > IV
(C) II > I > III > V > IV
(D) V> IV > Il > III >I