Which commercial technology commonly uses plasmas? a radio a race car a television a microwave oven?

a television is correct

The correct option is Television

In older times televisions used to use cathode ray tubes but now a days they use plasma. The principle is simple, instead of using a beam of electrons to create the lines on a TV screen, the plasma screen uses what are in effect tiny quick-acting fluorescent light cells to form a picture. But the problem is that they consume more amount of electricity for instance a 42-inch model often sucks up 200 to 500 watts, and a 60-plus-inch plasma screen can consume 500 to 600 watts.

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