Answer :

According to Bronsted-Lowry acid concept
 an acid is a that donate a proton" and a base is a "proton acceptor."so
  will look for that molecule to which  H2O "donates" H+to become OH−. so answer will be..
NH3+H2O→NH+4+OH
so correct option is NH3
hope it helps
 NH3

I hope this helps and have a wonderful day filled with joy!!

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