6. Provide the reagent(s) necessary to convert toluene to benzoic acid.(A) 1. NBS, Δ; 2. NaOH(B) 1. KMnO4/NaOH/H2O; 2. H3O+(C) HNO3/H2SO4(D) 1. CO2; 2. H3O+(E) none of the above