According to Franz Fanon in his book The Wretched of the Earth,

A. colonization need not be violent.
B. decolonization need not be violent.
C. decolonization is always violent.
D. colonization is an inevitable necessary evil.

http://www.openanthropology.org/fanonviolence.htm

According to Franz Fanon in his book The Wretched of the Earth, the answer is C. decolonization is always violent.

To arrive at this answer, you can approach it in the following way:

1. Read and understand the arguments presented by Franz Fanon in the book "The Wretched of the Earth." This will help you understand his perspective on colonization and decolonization.

2. Look for specific passages or chapters in the book where Fanon discusses colonization and decolonization. Pay attention to the arguments and evidence he presents to support his claims.

3. Analyze Fanon's arguments and reasoning. Consider the historical context and the experiences shared by those who went through colonization and decolonization processes. Look for any patterns or recurring themes in Fanon's analysis.

4. Assess the different options given in the question:
A. colonization need not be violent: If Fanon's argument suggests that colonization is inherently oppressive and dehumanizing, it is unlikely that he would argue that it can be nonviolent.
B. decolonization need not be violent: This is not in line with Fanon's position. He argues that decolonization is a process of liberation, and liberation often involves violent struggle against the colonizers.
D. colonization is an inevitable necessary evil: Although Fanon criticizes colonization, he does not suggest that it is an inevitable necessary evil.

5. Therefore, based on Fanon's arguments and conclusions, it can be concluded that C. decolonization is always violent is the most accurate answer according to his perspective.