The electrons which are primarily responsible for chemical bonds are:

a) the outer s subshell
b) the outer p subshell
c) the valence electrons
d) electrons with high ionization energy

Chemical bonds are defined as the ionic bond, covalent bond, and metallic bond by which atoms or ions are tied in a molecule.
therefore,
The electrons which are primarily responsible for chemical bonds are the valence electrons.
so the right option is C) the valence electrons

Nonmetal are moldable and easily shaped