In which set of compound/ion has linear geometry

Options

A. `CH_(4), NH_(4)^(+), BH_(4)^(-)`
B. `CO_(3)^(2-), NO_(3)^(-), BF_(3)`
C. `NO_(2)^(+), CO_(2), N_(3)^(-)`
D. `BeCl_(2), BCl_(3), CH_(4)`

Answer

C