Question

read the excerpt from neil degrasse tysons \death by black hole.\
black holes are regions of space where the gravity is so high that the fabric of space and time has curved back on itself, taking the exit doors with it. another way to look at the dilemma: the speed required to escape a black hole is greater than the speed of light itself. . . . light travels at exactly 299,792,458 meters per second in a vacuum and is the fastest stuff in the universe. if light cannot escape, then neither can you, which is why, of course, we call these things black holes.
which of the following features would best enhance the reader’s understanding of this excerpt?
a photograph of a black hole
a demonstration of the speed of light
an interactive animation of a black hole
a definition of the term black hole

Explanation:

The excerpt explains black holes' nature related to gravity, space - time curvature, and escape speed (faster than light). An interactive animation of a black hole can visually show the space - time curvature and why light can't escape, which directly relates to the excerpt's key concepts. A photograph may not show the dynamic aspects (like gravity's effect on space - time), a speed of light demonstration doesn't connect to black hole's gravity/escape, and the excerpt already describes black holes so a definition is less helpful.

Answer:

C. an interactive animation of a black hole