The best answer is A.
A chemical bond is said to be a lasting attraction occurring between atoms that causes them to form chemical compounds.
A bond that results from an attraction of atoms due to the opposite charges (electrostatic charges) on them is called an ionic bond. When two atoms share electrons , they get bonded together in a type of bond called a covalent bond.
Covalent and ionic bonds are the strongest types of chemical bonds that occur between atoms.
