Begin this dot structure with a B atom in the center. In each cardinal direction is one singly bonded F atom with three pairs of dots. The structure is then bracketed and a superscript of 1- is added.
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Square planar
Tetrahedral
trigonal pyramidal
. .x ..
It's trigonal pyramidal. You can do an easy calculation by considering the number of valence electrons, in this case 26, and then drawing a Lewis structure. The Lewis structure will have 8 electrons on each of the Oxygen atoms and a single lone pair on the sulfur. This lone pair gives Sulfite sp3 hybridized orbitals and trigonal pyramidal geometry.