Lightning rod bleeds off excess charge by A. Grounding
B. Charging
C. Induction
D. Draining

letter a."Grounding"

Explanation:

Why?

Because when the voltage at the end of the rod is sufficiently high it will bleed-off some of the induced lightning charge on the ground, streamers will be reduced or eliminated and the likelihood of a lightning strike is reduced. A corona develops at the tip of the rod, which sometimes can be seen

Chromatography ​is a method by which a mixture is separated by distributing its components between two phases. The stationary phase remains fixed in place while the mobile phase carries the components of the mixture through the medium being used.

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