Answer:
Isolation—this passage illustrates how sad Walton feels about having no one to share his success or failure with.
So they didn’t pass on disease
Answer:
When he retired I bought not only all his big equipment but all his little toolboxes as well—they were treasures!
Explanation:
I took this quiz. This shows his interest and being willing to invest in it.
All would seem appropriate, but I'd say D, since it assists you in gathering data to support your clause
