Answer
C
Work Step by Step
Nitrogen is in group 15, having 5 valence electrons so $N_3^-$ has 16
Oxygen is in group 16, carbon in 14.
$N_2O: 2×5+6=16$
$NO_2^+: 5+2×6-1=16$
$O_3: 3×6=18$
$CO_2: 4+6×2=16$
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