Stanley Miller had put the Oparin-Haldane theory to test in $1953$ by creating in the laboratory the probable conditions on the primitive earth. In the experiment,simple amino acids were synthesized from which of the following mixtures,as observed after eighteen days?

• A
  $H_{2}, O_{2}, N_{2}$ and $H_{2}O$
• B
  $CH_{4}, CN, H_{2}$ and $O_{2}$
• C
  $H_{2}, NH_{3}, CH_{4}$ and water vapour
• D
  $NH_{3}, CH_{4}$ and $O_{2}$