Question 1, Part A:
The meaning of integration as it is used in the paragraph is:
the practice of uniting different groups of people to provide to them the same advantages and opportunities.
Question 2, Part B:
The context that best helps the reader understand the meaning of integration is:
“...for job equality and for integration in schools and churches and on trains.”
This phrase highlights the idea of uniting different groups (in this case, people of different races) in various aspects of society.