Read the following paragraph from the introduction [paragraphs 1-3].
Holiday lights are a great way to learn about the flow of electric current. In a simple circuit,
including one in an incandescent light bulb, electricity travels through a closed circuit, passing
over a filament, causing it to glow brightly. The more current that passes over a filament, the
hotter it will get, the brighter it will burn, and the quicker it will burn out. If the circuit is broken, or
open, no electricity will pass over the filament and it will not light. If the current is too great, the
filament will melt, or blow out, causing the circuit to become open.
What is the main reason why the author includes this paragraph in the article?
(A) to introduce the main idea of holiday lights
(B) to compare different types of holiday lights
(C) to explain how to safely dispose of holiday lights
(D) to relate holiday lights to a scientific concept