Read the following selections from the article.
1. Benjamin Willis was in charge of Chicago's public schools at the time. He refused to treat segregation as a real problem.
2. As a result of these shifts, African-Americans were packed in neighborhoods with overcrowded and run-down schools. White neighborhoods, by contrast, had well-kept, orderly schools.
3. As they prepared, they got encouragement from Martin Luther King, Jr., who had spoken at the March on Washington a few months before.
4. The situation became worse each year. “The broken windows were there,” one teacher at DuSable High School wrote in the early 1970s, “along with the torn window shades and broken desk tops" and "the badly lighted, worn central hallway.”
Which two selections taken together BEST explain the causes of the Freedom Day boycott?
(A) 1 and 2
(B) 2 and 3
(C) 3 and 4
(D) 1 and 4