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Lightning is a flash of light caused by discharge of static electricity between clouds. Although most of the lightening is between clouds it can also take place between a cloud and the ground. Thus the correct option for the given fill in the blank question is:
Lightning is a discharge of static electricity.
Thus among the given options, the option 'b' is right.
Lightening is a discharge of static electricity,
Lightning is described as a powerful sudden flow of electricity (an electrostatic discharge) accompanied by thunder that occurs during an electric storm.
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