Explanation: The letter describes the difficulties that one settler encountered upon arriving in South Africa. The British settled South Africa, among other colonies, with little regard for the population that already lived there. There is no evidence for the diffusion of the two cultures, so eliminate (A). The author discusses the economic difficulties he experiences, so there is no discussion of a boon; eliminate (B). You can also eliminate (C), as the author is British, not Afrikaner, and does not mention Afrikaners. Thus, the best answer is (D).