Final answer:
Early twentieth-century West African writers include Amos Tutuola and Wole Soyinka from Nigeria, who gained international recognition for their works that contributed to the early rise of modern West African literature.
Step-by-step explanation:
Two early twentieth-century West African writers who began to emerge in the field of fiction are Amos Tutuola from Nigeria, who is well known for his 1952 novel 'The Palm-Wine Drinkard,' and Wole Soyinka also from Nigeria, who is a playwright, poet, and essayist awarded the Nobel Prize in Literature in 1986.
Although these writers became prominent after the period specified in the question, they are among the earliest internationally recognized figures from West Africa. The origins of modern West African literature can be traced back to this period, which marked the beginning of a significant cultural movement as African writers started to express their perspectives and critiques of society.