As an Analog of Graphite, a Material Composed of Boron

Multiple Choice

As an analog of graphite, a material composed of boron and nitrogen (B-N) has been prepared. Why do these elements make a good substitute for the element in graphite?
I.They are all elements with electrons in the 2p subshell.
II.The sum of the valence electrons of one boron atom and one nitrogen atom is the same as the number of valence electrons on two carbon atoms.
III.Boron and nitrogen have suitable 2p orbital overlap.

A) I only
B) II only
C) III only
D) I and II only
E) I, II, and III