Which structures of an atom take part in a chemical bond

The electrons of an atom, in particular valence electrons, are involved in chemical bonding.

Explanation: The reason is that the electrons are the most movable part of an element. The result of chemical bonding is that the two atoms share the electron density,

the answer would be c

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be