3. When pyridine is treated with a mixture of nitric and sulfuric acids, the major product is .
(A) 2-nitropyridine
(B) 3-nitropyridine
(C) 4-nitropyridine
(D) 3-aminopyridine
(E) 4-aminopyridine

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統計： A(0), B(5), C(0), D(0), E(0) #1072891