Detailed Instructions: In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.
Problem:Question: What countries participated in the war that started in October 1899 that Foulkes served in? Passage:Foulkes was educated at Bedford Modern School, and was commissioned into the Royal Engineers as a second lieutenant on 27 February 1894, followed by promotion to lieutenant on 27 February 1897. He served in Sierra Leone 1898–99 (later known as the Hut Tax War), for which he received the East and West Africa Medal. After the outbreak of the Second Boer War in October 1899, he was appointed on the Staff of the army in South Africa, and took part in a number of engagements and operations. He became Assistant Commissioner for the Anglo-French Boundary Commission in the East of Niger in late 1902, with the local rank of captain. After taking part in the Kano-Sokoto expedition which brought the Emirs in Nigeria under British control in 1903, he became Commander of the Ordnance Survey of Scotland in 1904. He was a member of the bronze medal-winning team for the field hockey in the 1908 Summer Olympics. He went on to be Commander of 31st (Fortress) Company in Ceylon in 1909 and Commander of 'L' Company at the Royal Engineers Depot in Chatham in 1913.
 Links: a. Sierra Leone Colony and Protectorate b. Field hockey c. Sokoto d. Second Boer War
Solution:
d