which commercial technology commonly uses plasmas?\n a radio\n a race car\n a television\n a microwave oven

Brief Explanations:

Plasma - based technology is commonly used in some types of televisions. Plasma TVs use small cells filled with plasma (ionized gas) that emits ultraviolet light to excite phosphors and produce an image. Radios use electromagnetic waves for signal - transmission, race cars are mechanical and automotive devices, and microwave ovens use microwaves to heat food.

Answer:

C. a television