Considering the definition of ancovalent bond,
First, you must know that the octet rule states that the atoms of the elements bond to each other in an attempt to complete their valence shell with eight electrons. In other words, the atoms will tend to give up or share electrons to complete eight electrons in the valence shell through an ionic, covalent or metallic bond.
In other words, the goal is to have the closest noble gas electron configuration, thus having the last complete electron shell and acquiring stability.
On the other side, a covalent bond is a force that joins two atoms of non-metallic elements to form a molecule. The bond is formed by sharing electrons between atoms. Shared electrons are common to the two atoms and it holds them together, so that both acquire the noble gas electronic structure and comply with the octet rule.
Finally, the correct answer is option d. the definition of a covalent bond is a bond between two atoms.
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