In a double covalent bond number of electron pairs shared are
2
3
4
6
2
A covalent bond is formed by the mutual sharing of one or more pairs of electrons between the two adjacent atoms that participate in bond formation.
A single covalent bond is formed by the sharing of two electrons of neighboring atoms.
Each atom contributes one electron in bond formation.
Thus, in the formation of a double covalent bond, two-electron pairs or four electrons are shared between adjacent atoms.
Therefore, option (A) is the correct option.