Which electronic configuration corresponds to an element of group IIIA ?

A. 1s2 2s2 2p4

B. 1s2 2s2 2p6 3s2 3p1

C. 1s2 2s2 2p6 3s2 3p6 4s2 3d1

D. 1s2 2s2 2p3

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