Thunder cloud is made up of charge that occurs due to friction of atmospheric conditions
Many particles of the atmosphere moves at high speed and all these motion the thundercloud get charge
Here this charge is negative and high with respect to the ground
Due to this high voltage difference occurs and it will make breakdown of atmospheric gases
So here charge on thundercloud will be same and hence it will exert repulsion force on each other
so correct answer will be
2) Repulsive
