The diagram represents Miller's experiment. Choose the correct combination of labelling.

• A
  $A$-electrodes,$B$-$NH_3 + H_2 + H_2O + CH_4$,$C$-cold water,$D$-vacuum,$E-U$ trap
• B
  $A$-electrodes,$B$-$NH_4 + H_2 + CO_2 + CH_3$,$C$-hot water,$D$-vacuum,$E-U$ trap
• C
  $A$-electrodes,$B$-$NH_3 + H_2O$,$C$-hot water,$D$-tap,$E-U$ trap
• D
  $A$-electrodes,$B$-$NH_3 + H_2 + H_2O + CH_4$,$C$-steam,$D$-vacuum,$E-U$ trap