水中硝酸盐经镉还原柱，使NO-N还原为NO-N，再与氨基苯磺酸铵反应。这种反应属于（）

A.氧化反应

B.还原反应

C.缩合反应

D.重氮化反应

E.耦合反应

Though he doesn't achieve his goals, he is not a failure. _____, he is remembered as a true hero.[ ]

A. In particular

B. On the contrary

C. Generally speaking

D. To be honest