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
"Living in a large home is the best situation for a child." is the correct answer.
Is there a story that goes with it if you could link it i may be able to help you. =)
