Which of following is the best example of a motif in the book Farewell to Manzanar?

A. President Roosevelt gave the war department permission to detain Japanese-Americans.
B. Caucasians were as terrified of Japanese-Americans as Japanese-Americans were of Caucasians.
C. The Wakatsukis, most of whom were U.S. citizens, were repeatedly forced by the government to move from their home.
D. No matter what they did, the Wakatuskis were unable to stop the dust from coming into their rooms.