The electronic configuration 1s2 2s2 2p3 corresponds to the element nitrogen (N).
The electronic configuration 1s2 2s2 2p4 corresponds to the element oxygen (O).
The electronic configuration 1s2 2s2 2p1 corresponds to the element boron (B).
The electronic configuration 1s2 2s2 2p2 corresponds to the element carbon (C).
The element that belongs to group IIIA (Group 13) of the periodic table is boron (B), so the correct option is C. 1s2 2s2 2p1.
