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 miles long is the river that Silvanus drove the Alamanni tribesmen back from? Passage:Silvanus was born in Gaul, the son of Bonitus, a Laetic Frankish general who had supported Constantine I in the civil war against Licinius. Like so many other Franks of his times, and like his father before him, he was a loyal and thoroughly romanized "barbarian" in the military service of the Empire. By AD 351, he held the rank of tribune and was one of the senior officers who defected to Emperor Constantius II at the Battle of Mursa Major, after initially supporting the usurper Magnentius. An able soldier, Silvanus was eventually promoted to the rank of Magister militum per Gallias, a crucial post, then in AD 352-353, Constantius personally entrusted him with the difficult task of driving the Alamanni tribesmen raiding and looting in Gaul back beyond the Rhine, and restoring the fast eroding Roman authority in the province. This Silvanus fulfilled partly by bribing the Alamanni chieftains with the taxes he had collected, partly by defeating the Alamanni in battle and partly by suppressing the local bagaudae insurrections flaring up again in central and northern Gaul.
Links: a. Bonitus (magister militum) b. Constantine the Great c. Rhine d. Rhine
c

Question: Where was Thomas Kenan's great grandfather born? Passage:Thomas Stephen Kenan (February 12, 1838 December 23, 1911) was a Confederate soldier, and later a politician. His parents were Sarah Rebecca Graham and Owen Rand Kenan; he was the grandson of U.S. Congressman Thomas Kenan and great-grandson of Revolutionary War general James Kenan. He started his education in Duplin County, North Carolina at Old Grove Academy in Kenansville (the town was named for his great-grandfather in 1818). Later he spent a year at Central Military Institute in Selma, Alabama. Thomas spent his freshman year of college at Wake Forest in June. Thomas then transferred his sophomore year to the University of North Carolina, where he would graduate in 1857. He studied law for two years with Judge Pearson at Richmond Hill where he practiced law in Kenansville. After graduation and during the Civil War he became Captain of the Duplin Rifles in the Confederate States Army, elected lieutenant colonel of the 43rd North Carolina Infantry Regiment in April 1862, and was promoted to colonel later that year. He was wounded at the Battle of Gettysburg. While on an ambulance train, he and his older brother James Kenan were both captured; they were then imprisoned on Johnson's Island, Ohio. On March 22, 1865, he was released on parole but never switched sides during the war. On his return home he was elected to the state legislature from 1865 to 1867. Later that year he ran for Congress and lost. Not letting that defeat end his political career, he moved to Wilson, North Carolina, where he became mayor and was elected North Carolina Attorney General, serving from 1877 to 1885. In May 1868 he married Miss Sallie Dortch, but they had no children; Sallie died in 1916.
Links: a. 43rd North Carolina Infantry b. American Civil War c. Owen Rand Kenan d. James Kenan
d

Question: Who was on the Supreme Court the year it ruled to remove prayer from schools? Passage:On July 10, 1961, Shehan returned to Baltimore as its Coadjutor Archbishop (with right of succession) and Titular Archbishop of Nicopolis ad Nestum. He succeeded Francis Patrick Keough as Archbishop of Baltimore on December 8 of that same year. In this position, he led the nation's first diocese and held precedence, except for Cardinals created earlier and without the honorary title of primacy, over the Church in America. After the Supreme Court ruled to remove prayer from public schools in 1962, Shehan warned that "secularization threatens to become a sort of state religion established by court decree". He was also a strong advocate of civil rights, banning segregation in all of Baltimore's Catholic institutions and walking in the March on Washington for Jobs and Freedom in 1963. He also maintained relations with Judaism and Eastern Orthodoxy. Cardinal Shehan worked with his friend Harry Lee Doll, Episcopal Bishop of Maryland and President of the Maryland Council of Churches on both civil rights and ecumenical issues. Along with the President of St. Mary's Seminary and University, Cardinal Shehan and Bishop Doll in 1968 founded Baltimore's Ecumenical Institute, in the city's Roland Park neighborhood.
Links: a. Diocese b. Supreme Court of the United States c. Nicopolis ad Nestum d. Diocese
b