Writing as an African who had been "Europeanized," Achebe wrote Things Fall Apart as "an act of atonement with [his] past, the ritual return and homage of a prodigal son." By his own act, he encourages other Africans, especially ones with Western educations, to realize that they may misperceive their native culture.
Are there any options given? From this, I would say the answer is diction.
