(C) The bond angles for the given molecules are as follows:$NH_3$: $107^o$ (due to one lone pair)$BeF_2$: $180^o$ (linear geometry)$H_2O$: $104.5^o$ (

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(C) The bond angles for the given molecules are as follows:$NH_3$: $107^o$ (due to one lone pair)$BeF_2$: $180^o$ (linear geometry)$H_2O$: $104.5^o$ (due to two lone pairs)$CH_4$: $109.5^o$ (tetrahedral geometry)Comparing these values,$H_2O$ has the smallest bond angle of $104.5^o$.