$\text{Na}$ and $\mathrm{Li}$ are placed in dry air, we get:

• A

  $\mathrm{NaOH},{\mathrm{Na}}_2\mathrm{O},{\mathrm{Li}}_2\mathrm{O}$
• B

  ${\mathrm{Na}}_2\mathrm{O},{\mathrm{Li}}_2\mathrm{O}$
• C

  ${\mathrm{Na}}_2\mathrm{O},{\mathrm{Li}}_2\mathrm{O},{\mathrm{Li}}_3\mathrm{N},{\mathrm{NH}}_3$
• Correct answer
  D

  ${\mathrm{Na}}_2\mathrm{O}, {\mathrm{Li}}_3\mathrm{N}, {\mathrm{Li}}_2\mathrm{O}$

Hence, the correct answer is option: 'D'.