Why Does the Seesaw Molecular Geometry (Ss) Have a Lower

Multiple Choice

Why does the seesaw molecular geometry (ss) have a lower energy than the trigonal pyramidal molecular geometry (tp) in an AB₄ molecule with a trigonal bipyramidal electron-pair geometry?

A) The ss geometry has fewer lone-pair bonding-pair interactions at 90^o.
B) The ss geometry has fewer lone-pair bonding-pair interactions at 120^o.
C) The ss geometry has fewer bonding-pair bonding-pair interactions at 120^o.
D) The ss geometry has fewer bonding-pair bonding-pair interactions at 90^o.
E) The ss geometry has fewer lone-pair lone-pair interactions at 90^o.