In "The Language of African Literature," what does Ngugi wa Thiong'o say changes for indigenous peoples when they are forced to learn another language?
A.Their families become more closely knit because they only speak the native language with one another.
B.Their families gain wealth but lose their independence.
C.Their horizons are expanded, and they have greater life opportunities.
D.Their personal identity is changed, and their thoughts are no longer their own.