I'm pretty sure A is the secondary source. All of the others come directly from the source/person, but an interview is getting someone else's view.
Wages, health, treatment of workers and farmers.
This eventually lead to the Russian Revolution since workers were unsatisfied with how they were treated and how they all lacked the amount of money to purchase basic necessities such as bread.
Hope this helps!
Industrialization moved the economy away from agriculture.
a. because it is relatively stable
