Which of the following sentences best expresses the main idea of the selection?
A.After moving from Harlem to Grand Rapids, Michigan, the author had numerous adjustments to make.
B.Eighth grade can be a challenging time for a new student.
C.Using unusual methods, Miss Bean helped her eighth-grade students learn to think for themselves.
D.A teacher helped the first black student in school to be accepted and to learn to think for himself.