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Two elements \( \mathrm{A} \) and \( \mathrm{B} \) form compounds \( \mathrm{AB}_{2} \) and \( \mathrm{AB}_{4} \) (both are non-volatile and non-electrolyte). When dissolved in \( 20.0 \mathrm{~g} \) of benzene, \( 1 \mathrm{~g} \) of \( \mathrm{AB}_{2} \) lowers the freezing point of benzene by \( 2.3 \mathrm{~K} \), whereas \( 1.0 \mathrm{~g} \) of \( \mathrm{AB}_{4} \) lowers it by \( 1.3 \mathrm{~K} \) \( \left[\mathrm{K}_{\mathrm{f}}\right. \) (benzene) \( \left.=5.5 \mathrm{~K} \mathrm{~mol}^{-1} \mathrm{~kg}\right] \). Thus, atomic masses of \( \mathrm{A} \) and \( \mathrm{B} \) respectively, are
(a) 120,212
(b) 96,28
(c) 212,120
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