Oxidation of toluene to benzaldehyde can be easily carried out with which of the following reagents?
A) CrO₃/Acetic acid, H₃O
B) CrO₃/Acetic anhydride, H₃O
C) KMnO₄/HCl, H₃O
D) CO/HCl, Anhydrous AlCl₃