下述反应中那种物质被氧化  乙醛 + NA DH + H+ → 乙醇 + NAD+

A、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">乙醛</span>

B、<span style="FONT-FAMILY: &#39;Times New Roman&#39;; FONT-SIZE: 14px">NA DH</span>

C、<span style="FONT-FAMILY: &#39;Times New Roman&#39;; FONT-SIZE: 14px">NAD+ </span>

D、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">乙醇</span>