Look at this illustration from A Black Hole Is NOT a Hole. A film strip with 3 images of a red circle with a black dot in the center and a black ring. Image 1 shows an arrow entering the top left of the frame. Image 2 shows the arrow straight over the circle and starting to move downward on the right side. Image 3 shows the arrow spiraling into the center of the circle.

Which image has a similar purpose?

A small sphere followed by a long tail.
A black sphere back lit by several stars.
A cloud of gases.
Gases extend away from a star and spiral into the center of a black hole.