The correct option is A the charge acquired by its atom on the basis of electronegative consideration from other atoms in the molecule
The oxidation state of an element in a particular compound can be defined as the charge acquired by its atom on the basis of electronegative consideration from other atoms in the molecule.
In other words, it represents the number of electrons gained or lost by the element or ion in the reaction that formed the compound. It is expressed as a positive or negative number which represents the ionic charge . For example, in sodium chloride, the oxidation states of sodium and chlorine are +1 and -1 respectively.