What causes static electricity

There are several ways this condition can be caused:
One way is by rubbing certain materials together or pulling them apart. Another way that static electricity commonly seen is when a charged material is brought near a neutral material. This is called electrostatic induction. You can also cause static electric separation of charges by using pressure in certain materials or using heat in other materials.

A stationary electric charge, typically produced by friction, that causes sparks or crackling or the attraction of dust or hair

The answer is b.the gaseous state is electrically positive, while the plasma state is electrically negative. 

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