In which substance is the oxidation number of the nitrogen atom the same as that of the nitrogen atom in $\text{HNO}_2$? For the other elements in these compounds, take the following oxidation numbers: $\text{H}, +1;\ \text{F}, -1;\ \text{O}, -2.$
- A$\text{NF}_3$
- B$\text{NH}_4^+$
- C$\text{NO}$
- D$\text{NO}_2^+$