A homeless shelter in Illinois held a "sleep out," a protest to alert members of the general public to the dangers of letting funding for homeless shelters drop, forcing shelters to turn away people in need. The organizers of the rally saw their work as particularly important because they suspected that most residents did not realize just how many poor people existed in their community, a result of what sociologists would call:a. problematic categories.
b. the invisibility of poverty.
c. the just-world hypothesis.
d. the latent function of welfare.

The invisibility of poor means to ignore the poor community that also lives with you in your society. In the above context, Illinois held a sleep out. They protest to alert the member in the general public which letting homeless funding shelters and forcing people to turn away from the people who are in need.

The organizers in the rally, they see that most of the people they are aware of the people of the poor community that are living in the society. A research result shows that sociologists would call it the invisibility of poverty by other people.