C. may be
D. may not be
This question was addressed to me in examination.
This intriguing question comes from s-Block Elements topic in division s-Block Elements of Chemistry – Class 11
For explanation I would say: Yes, Lithium which is unlike the other alkali metals, reacts with nitrogen to form the nitride six moles of lithium combine with one mole of a nitrogen atom, in order to form two moles of lithium nitride.