(A) The stability of hydrides of group $15$ elements decreases down the group as the bond dissociation enthalpy decreases.As we move from $N$ to $Bi$,

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(A) The stability of hydrides of group $15$ elements decreases down the group as the bond dissociation enthalpy decreases.As we move from $N$ to $Bi$,the size of the central atom increases,which leads to a weaker $M-H$ bond.Therefore,$NH_3$ is the most stable hydride among the given options.