The right option is; A. covalent bonds
The phrase “opposites attract” can be seen very clearly in covalent bonds.
A covalent bond is a molecular bond that occurs when pairs of electrons are shared between atoms. The bond is caused by the electrostatic attraction of their nuclei for the same electrons. When electrons are shared, it makes each atom to fill up their outer electron shell and gain stability. When two atoms of the same element share electrons through covalent bonding, the electrons are shared equally between the atoms, but if it is shared between atoms of different elements, the electron will be drawn (attracted) more toward the atom that has the higher electronegativity which will cause a polar covalent bond.
