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.

Question: How many years were there between the end of the British Burma Campaign and the start of the Battle of Na San? Passage:The First Indochina War had raged, as guerrilla warfare, since 19 December 1946. From 1949, it evolved into conventional warfare, due largely to aid from the communists of the People's Republic of China ("PRC") to the north. Subsequently, the French strategy of occupying small, poorly defended outposts throughout Indochina, particularly along the Vietnamese-Chinese border, started failing. Thanks to the terrain, popular support for August Revolution and support for decolonization from bordering China and the U.S.S.R., the Viet Minh had succeeded in turning a "clandestine guerrilla movement into a powerful conventional army", following asymmetric warfare theory laid by Mao Tse Tung, something which previously had never been encountered by the western colonial powers. In October 1952, fighting around the Red River Delta spread into the Thai Highlands, resulting in the Battle of Nà Sản, at which the Viet Minh were defeated. The French used the lessons learned at Nà Sản – strong ground bases, versatile air support, and a model based on the British Burma Campaign – as the basis for their new strategy. The Viet Minh, however, remained unbeatable in the highland regions of Vietnam, and the French "could not offset the fundamental disadvantages of a roadbound army facing a hill and forest army in a country which had few roads but a great many hills and forests".
 Links: a. China b. On Guerrilla Warfare c. Battle of Nà Sản d. China
c

Question: When was the organization founded to which Cross received appointment as a chevalier? Passage:Colonel Marie Augstin Gaston Cros (known as Gaston Cros) (6 October 1861 – 10 May 1915) was a French army officer and archaeologist. He was born in Alsace and was displaced when that territory was incorporated into the German Empire. He joined the French Army as a lieutenant and saw action in Tonkin before spending several years surveying in Tunisia, receiving the honours of membership of Vietnamese and Tunisian orders and appointment as a chevalier of the Legion of Honour. In 1901 Cros was appointed head of the French archaeological expedition to Girsu, Iraq to continue the work of Ernest de Sarzec. His work over the next five years included the tracing of the thick city wall and for his work there received a letter of commendation from Gaston Doumergue, the Minister of Fine Arts, and the award of the Golden Palms of the Ordre des Palmes Académiques. Promoted to lieutenant-colonel, Cros served in the French protectorate of Morocco from 1913, seeing action in the Zaian War.
 Links: a. Tonkin b. Zaian War c. Ernest de Sarzec d. Legion of Honour
d

Question: What country did Fukai attend college in? Passage:Fukai was born in Fujikawa, Yamanashi on September 13, 1980. After graduating from Komazawa University, he joined J1 League club Kashima Antlers in 2003. He played many matches every season. Antlers won the 2nd place in 2003 and 2006 J.League Cup. In 2007, he moved to Albirex Niigata. In 2008, he moved to Nagoya Grampus. However he could not play many matches. In August 2008, he moved to JEF United Chiba. He played many matches as forward with Seiichiro Maki who was teammate at Komazawa University. However JEF United finished at the bottom place in 2009 season and was relegated to J2 League first time in the club history. Although he played many matches until 2012, he could not play many matches for injury in 2013 and resigned end of 2013 season. In July 2014, he joined J2 club V-Varen Nagasaki and played in 2 seasons. In 2016, he moved to J3 League club SC Sagamihara and played many matches. He retired end of 2016 season.
 Links: a. Komazawa University b. Komazawa University c. 2009 J.League Division 1 d. Nagoya Grampus

a