In his classic experiment on the formation of amino acids, Stanley Miller passed an electric discharge in a mixture of [CPMT 1983, 89; MP PMT 2003; CPMT 2001]

• A.            Steam, \[C{{H}_{4}},{{H}_{2}}\]and \[N{{H}_{3}}\]
• B.            \[C{{H}_{4}},C{{O}_{2}},{{O}_{2}}\]and \[{{H}_{2}}\]
• C.            \[N{{H}_{3}},{{O}_{2}},{{H}_{2}}\] and steam
• D.            \[C{{H}_{4}},{{H}_{2}},{{N}_{2}}\]and steam