Ariel is writing the middle of her essay about black holes. Which detail would be the best fit for the middle?

A .Black holes can be found anywhere in space. The closest black hole to Earth is thousands of light years away.
B. Black holes continue to amaze and mystify scientists today. There is so much more to learn about this complex phenomenon.
C. A black hole is an area in space that has an extreme gravitational pull that not even light can escape.
D. Matter is packed tightly within a black hole, making the center of a black hole very dense