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 people died in the incident that contaminated about 30,000 km?  Passage:Natural strontium is a mixture of four stable isotopes: Sr, Sr, Sr, and Sr. Their abundance increases with increasing mass number and the heaviest, Sr, makes up about 82.6% of all natural strontium, though the abundance varies due to the production of radiogenic Sr as the daughter of long-lived beta-decaying Rb. Of the unstable isotopes, the primary decay mode of the isotopes lighter than Sr is electron capture or positron emission to isotopes of rubidium, and that of the isotopes heavier than Sr is electron emission to isotopes of yttrium. Of special note are Sr and Sr. The former has a half-life of 50.6 days and is used to treat bone cancer due to strontium's chemical similarity and hence ability to replace calcium. While Sr (half-life 28.90 years) has been used similarly, it is also an isotope of concern in fallout from nuclear weapons and nuclear accidents due to its production as a fission product. Its presence in bones can cause bone cancer, cancer of nearby tissues, and leukemia. The 1986 Chernobyl nuclear accident contaminated about 30,000 km with greater than 10 kBq/m with Sr, which accounts for 5% of the core inventory of Sr.
 Links: a. Rubidium b. Mass number c. Electron capture d. Chernobyl disaster
d

Question: In what city and state did the music festival take place where DeVotchKa's performance was considered a breakout event? Passage:Originally a backing band for burlesque shows, in their early years DeVotchKa also toured with burlesque performer and model Dita Von Teese. Numerous nationwide tours in support of self-released records earned the band an underground following. Their song "How It Ends" introduced the band to a wider audience after being featured in the trailer for Everything Is Illuminated, in a Gears of War 2 trailer called "The Last Day", and in an episode of Everwood (Season 4). Their performance at the 2006 Bonnaroo music festival was considered a breakout event. In between tours, the band was picked by first time film directors Jonathan Dayton and Valerie Faris to score Little Miss Sunshine, a 2006 film that would go on to garner four Academy Award nominations. DeVotchKa, along with composer Mychael Danna, composed and performed the majority of the music for the film's soundtrack and were nominated for a 2006 Grammy Award for Best Compilation Soundtrack. The main song, "The Winner Is", was also used in a commercial by the French-based environment and energy company Suez and the Dutch pension fund PGGM.
 Links: a. Gears of War 2 b. Everything Is Illuminated (film) c. Bonnaroo Music Festival d. Stichting Pensioenfonds Zorg en Welzijn
c

Question: What year did the war end in which Haydock enlisted in the Queen's Own Cameron Highlanders? Passage:Haydock was a graduate of Glasgow University and was a travelling salesman for the Clydevale Oil & Colour Company, Bridgeton. In September 1914, one month after the outbreak of the First World War, Haydock enlisted in the Queen's Own Cameron Highlanders. In January 1915, he was commissioned as a second lieutenant in the Cameronians (Scottish Rifles). Haydock saw action at Gallipoli and Palestine before being seriously wounded during an attack on Umbrella Hill during the Third Battle of Gaza on 1 November 1917. He did not return to his battalion until August 1918, after it had been deployed on the Western Front. Haydock was wounded during an attack on the Hindenburg Line, west of Quéant on 2 September 1918 and died the same day at a Casualty Clearing Station in Bailleulval. He was buried in Bac-du-Sud British Cemetery, Bailleulval.
 Links: a. Casualty Clearing Station b. World War I c. Casualty Clearing Station d. World War I

b