The correct order of bond angles (smallest first) in H₂S, NH₃, BF₃ and SiH₄ is

• H₂S < SiH₄ < NH₃ < BF₃

• H₂S < NH₃ < BF₃ < SiH₄

• NH₃ < H₂S < SiH₄ < BF₃

• H₂S < NH₃ < SiH₄ < BF₃