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.

[EX Q]: 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
[EX A]: d

[EX Q]: Question: What team did Drogba score the winning goal against in the final? Passage:In July 2004, Drogba moved to Premier League club Chelsea for a club record £24 million fee, making him the most expensive Ivorian player in history. In his debut season he helped the club win their first league title in 50 years, and a year later he won another Premier League title. His displays saw him named in the FIFA World XI for 2007. In March 2012, he became the first African player to score 100 Premier League goals. Just two months later, he scored in Chelsea's 2012 FA Cup Final win over Liverpool to become the first (and , the only) player to score in four separate FA Cup finals. He also played in the 2012 UEFA Champions League Final, in which he scored an 88th-minute equaliser and the winning penalty in the deciding shoot-out against Bayern Munich. After spending 6 months with Shanghai Shenhua in China, and one and a half seasons with Turkish club Galatasaray where he scored the winning goal in the final of the 2013 Turkish Super Cup, Drogba returned to Chelsea in July 2014. With a career record of scoring 10 goals in 10 finals winning 10 trophies at club level, Drogba has been referred to as the "ultimate big game player." He joined Canadian club Montreal Impact in 2015 as a Designated Player and played 41 matches over two seasons, scoring 23 goals. Drogba became a player–owner for Phoenix Rising of the United Soccer League in 2017, and retired a year later at the age of 40.
 Links: a. 2012 FA Cup Final b. List of FA Cup Finals c. 2013 Turkish Super Cup d. FIFPro
[EX A]: c

[EX Q]: Question: How many career hits did the man that Pete Browning  would have tied for career batting average had he not had a hit taken away have? Passage:Mullane's no-hitter for the Louisville Eclipse was nearly derailed in the ninth inning, however; with two out, Pop Snyder of the Cincinnati Red Stockings lofted a fly ball to center field, but John Reccius mishandled what should have been an easy catch. Snyder, now on first base, complained to Walsh that Mullane was bringing his arm above his shoulder when pitching, which was not permitted at the time. Walsh overruled the complaint, however, and Mullane got Dan "Ecky" Stearns to ground out to end the game. The game was also notable for another incident in the eighth inning; the American Association's rules at that time permitted a substitute to run for a batter who was injured, as long as both teams' captains consented, with the substitute standing behind home plate and prepared to run if the hitter made contact. Pete Browning, who had a pulled leg muscle and had not reached base in the game, batted what appeared to be a single into right field, but forgot the presence of the substitute (Hecker) and ran to first base as Hecker stopped in surprise. Snyder, the Cincinnati catcher, had pitcher Will White throw the ball to Stearns at first base, and Walsh immediately signaled an out, ruling that Hecker was the correct runner and had not reached first. The lost hit eventually resulted in Browning's final career batting average being .341 rather than .342; the higher average would have tied him with Dan Brouthers for the highest mark among players of the era before , when the pitching distance was extended from 50 to 60'6".
 Links: a. Pitcher b. Pete Browning c. Dan Brouthers d. Dan Brouthers
[EX A]:
c