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.
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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

Answer: d


Question: Question: How long has the location at the fish's southernmost range been a country? Passage:The cocinero (Caranx vinctus), also known as the barred jack and striped jack, is a species of small marine fish classified in the jack family, Carangidae. The cocinero is distributed through the tropical eastern Pacific Ocean, ranging along the west American coastline from Baja California in the north to Peru in the south. It is a pelagic species, inhabiting the upper water column in both coastal and offshore oceanic waters, occasionally making its way into estuaries. The species may be identified by its colouration, having 8 or 9 incomplete dark vertical stripes on its sides, with scute and gill raker counts also diagnostic. It is small compared to most other species of Caranx, reaching a length of 37 cm in total. The cocinero is a predatory fish, taking small fishes, crustaceans, and various benthic invertebrates in shallower waters. Little is known of the species' reproductive habits. The cocinero is of moderate importance to fisheries along the west coast of South America, and the species has been used in aquaculture trials. It is taken by various netting methods and by spear, and is sold fresh, dried, and salted at market.
 Links: a. Gill raker b. Shore c. Peru d. Aquaculture

Answer: c


Question: Question: Who named the gliding lizard that was the topic  of her Ph.D. thesis? Passage:Robinson was born in Manchester to James Arthur Robinson and Ann (née Lamplugh) in 1919. She went to a private school and later the Manchester Girls' High School. After the divorce of her parents in 1938 she went to the University of Hamburg for premedical studies but this was interrupted by the war. Returning to England, she worked at the British Woollen Industries Research Association in Leeds where she attended evening lectures in Paleontology at Leeds University by Dorothy Rayner, which captured her interest. She worked from 1942 to 1945 at the Royal Ordnance factory at Thorp Arch, West Yorkshire. She worked for about two years as a librarian at the Geological Society in London before enrolling for geology at the University College London in 1947. She was influenced at university by J. B. S. Haldane, Walter Georg Kühne and D. M. S. Watson. Graduating in 1951 with first-class honours, he continued post-graduate research and became an assistant lecturer in zoology. She received a Ph.D. in 1957 for her studies on the gliding lizard Kuehneosaurus but she also studied the stratigraphy and fossils of the Mendip Hills in Gloucestershire. She published on the Late Triassic fauna of the Bristol Channel. She was invited through the influence of Haldane to the Indian Statistical Institute at Calcutta by Prasanta Chandra Mahalanobis and helped establish a geology department there. She mentored and influenced Indian researchers and created a program for the study of the paleontology of the Gondwana strata as well as the Maleri Formation in the Deccan region. A symposium on Gondwana Stratigraphy was held in 1967.
 Links: a. D. M. S. Watson b. University of Hamburg c. Kuehneosaurus d. Dorothy Helen Rayner

Answer:
c