(B) The bond angle of $120^o$ corresponds to $sp^2$ hybridization.In $sp^2$ hybridization,one $s$ orbital and two $p$ orbitals are mixed.The total num

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(B) The bond angle of $120^o$ corresponds to $sp^2$ hybridization.In $sp^2$ hybridization,one $s$ orbital and two $p$ orbitals are mixed.The total number of orbitals involved is $3$.The fraction of $s-$ character is $\frac{1}{3}$.The percentage of $s-$ character is $\frac{1}{3} \times 100 \approx 33.33 \%$,which is nearly $33 \%$.