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