A covalent chemical bond is one in which -


(A) outer-shell electrons of one atom are transferred to the inner electron shells of another atom.

(B) outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms.

(C) electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged.

(D) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms.