Most likely it is people use it in a sentence
It's pretty simple. You only need to focus on the reasons why people are homeless. Do they have good education? do they get better job? Or do they find ways inorder not to be homeless? Questions like that will help you determine why? and what can be the solutions inorder for them not to be homeless.
I think that there is an error in the answer options.
Rather than farmer:microscope, it should be scientist:microscope.
A librarian is a person who handles tangible objects of the job.
Likewise, a scientist is a person who handles the tangible object of a microscope.
Answer: B) Scientist: Microscope
