Who among the following African writers observed that “O my body, make of me always a man who questions”?

The correct option is Frantz Fanon.

Explanation:
The quote “O my body, make of me always a man who questions!” (originally in French: “O mon corps, fais de moi toujours un homme qui interroge!”) is the famous closing line of Frantz Fanon's seminal 1952 book, Black Skin, White Masks (Peau noire, masques blancs).

Frantz Fanon was a Martinican psychiatrist, philosopher, and revolutionary writer whose work focused on the psychopathology of colonization and the social and cultural consequences of decolonization. In the final chapter of Black Skin, White Masks, Fanon reflects on the human condition, identity, and the struggle to overcome the historical and bodily limitations imposed by racial prejudice. By pleading to his body to make him a person who constantly questions, Fanon emphasizes the importance of critical consciousness, self-reflection, and refusing to accept pre-established racial categories or dogmatic truths.