Final answer:
Amilcar Cabral was a key figure in the decolonization process, leading the resistance in Guinea-Bissau against Portuguese rule, which contributed significantly to the decline and fall of the Portuguese empire.
Step-by-step explanation:
Amilcar Cabral played a crucial role in the decolonization of the Portuguese empire by leading the African Party for the Independence of Guinea and Cape Verde (PAIGC) in its battle for liberation in Guinea-Bissau. This was a time when Portugal, under its nationalistic, quasi-fascist government, refused to renounce its colonies, viewing them as integral parts of the nation and as preservers of order in Africa. The strife led by Cabral and other African nationalists was vital for igniting the flame of independence across Portuguese colonies, and their persistent resistance culminated in the eventual decline and end of the Portuguese empire in Africa. Consequently, the correct answer to the question is B) He was a key figure in the decolonization process, contributing to the end of the Portuguese empire.