1. How do the sentences in paragraph 3 help to develop the key concept of that paragraph?
a. by describing parents who were unwilling to send their children to Central High School
b. by describing the daily routine of African-American students who were already attending Central High School
c. by describing how officials tried to calm parents of African-American students at Central High School
d. by describing efforts to discourage African-American students from wanting to attend Central High School