38. 2D materials are crystalline solids comprising a single layer of atoms. The most well-known 2D material is graphene, which is in the form of a plane of $\mathfrak{sp}^2$-bonded C atoms. Using the graphene structure as a hint, select the LEAST possible element that can form a 2D material.
(A) Si
(B) B
(C) P
(D) Bi
(E) S
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