Which species lacks tetrahedral geometry?

1. BH4- 2. NH2-
3. CO32- 4. H3O+
HINT: Molecule having sp3 hybridization has tetrahedral geometry.
Explanation:
STEP 1: 
The sum of lone pair and sigma bond  represents hybridization. If sum is 4 then hybridization is sp3, if sum is three than hybridization is sp2 and if sum is two then hybridization is sp.
STEP 2:
In BH4-, boron form four sigma bonds and doesnot contains any lone pair . Hence its hybridization is sp3 and geometry is tetrahedral.
In NH2-, nitrogen form two sigma bonds and contains two lone pairs . Hence, sum is 4 and hybridization is sp3.  The geometry is tetrahedral.
In CO32-, carbon form three sigma bonds and doesnot any lone pairs . Hence, sum is 3 and hybridization is sp2.  The geometry is trigonal planar.
In H3O+, oxygen form three sigma bonds and contains one lone pair. Hence, sum is 4 and hybridization is sp3.  The geometry is tetrahedral.
STEP 3: 
Hence, CO32-does not has tetrahedral geometry.