The correct option is A catenation
∙ Catenation is a unique property by which carbon form bonds with other atoms of carbon, giving rise to large molecules.
∙ Carbon has a valency of four, which makes it capable of bonding with four other atoms of carbon or atoms of some other element. This property of carbon is known as tetravalency.
∙ Polarity, in chemical bonding, refers to the separation of electric charges due to difference in electronegativity of bonded atoms.