Definition: 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.
Input: Question: Which person that the Ibicaba recieved when it was a military headquarters was oldest? Passage:The Ibicaba Farm (in Portuguese: Fazenda Ibicaba) is one of the most known farms of Brazil. Established in 1817 by senator Nicolau Vergueiro, it was widely known as one of the most macabre symbols of the slavery in the state of Sao Paulo. Afterwards, it has become the pioneer in the replacement of the African enslaved by the European immigrants' labour and in the use of the steam engine, cart and plough. The Ibicaba has also served as a military headquarters during the War of the Triple Alliance, receiving the Emperor Dom Pedro II, the princess Isabel and the count Gaston of Eu. In the 19th century, it was the stage to the revolt of the European immigrants, led by Thomaz Davatz, who achieved to show the European authorities the conditions in which their former citizens lived in Brazil. By 1882, the Italian immigration to Brazil grew significantly, encouraging the aftermost massive immigrations of Italians to the whole state of Sao Paulo, including its capital. In 1890, the farm was bought by the Levy family, and then reduced thanks to the allotment and inheritance conditions. Since the 1990s, it's being used as a museum and tourist site.
Links: a. Pedro II of Brazil b. Brazil c. Paraguayan War d. Brazil
Output:
c