In the darkness, a pinpoint of light becomes visible. Someone has turned on a flashlight. The pinpoint grows to the size of the
bulb. Because this is slow motion, only the bulb is bright. Nothing else lights up—yet. Now the light begins to spread outward from the bulb. It fills a bigger and bigger space. As the light moves forward, it strikes little fog droplets, the ground, a sneaker, a tree, a cat. After each collision, some light bounces off. It is redirected. Some of it reaches a person's eyes. Only then can the light trigger the person's eyes and brain. In slow, stretched-out speech, the person says, "L000000-000000k! Aaaaaaaaaaaa caaaaaa-aaat!"
—A Black Hole Is NOT a Hole,
Carolyn Cinami DeCristofano
Why did the author include this description?
A to explain how a star produces light
B to explain how light travels
C to explain how cats see in the dark
D to explain how fog forms
PLS HELP
