# The correct order of bond angles (smallest first) in $H_2S, \; NH_3, \; BF_3$ and $SiH_4$ is
( A ) $NH_3 < H_2S < SiH_4 < BF_3$
( B ) $H_2S < NH_3 < BF_3 < SiH_4$
( C ) $H_2S < NH_3 < SiH_4 < BF_3$
( D ) $H_2S< SiH_4 < NH_3 < BF_3$