Which set contains only covalently bonded molecules?

  • A
    $BCl_3$,$SiCl_4$,$PCl_3$
  • B
    $NH_4Br$,$N_2H_4$,$HBr$
  • C
    $I_2$,$H_2S$,$NaI$
  • D
    $Al_2O_3$,$As_4$

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