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.

Q: Question: When was the man whose name is used as the unit of radio wave frequency born?  Passage:A modulated radio wave, carrying an information signal, occupies a range of frequencies. See diagram. The information (modulation) in a radio signal is usually concentrated in narrow frequency bands called sidebands (SB) just above and below the carrier frequency. The width in hertz of the frequency range that the radio signal occupies, the highest frequency minus the lowest frequency, is called its bandwidth (BW). A given amount of bandwidth can carry the same amount of information (data rate in bits per second) regardless of where in the radio frequency spectrum it is located, so bandwidth is a measure of information-carrying capacity. The bandwidth required by a radio transmission depends on the data rate of the information (modulation signal) being sent, and the spectral efficiency of the modulation method used; how much data it can transmit in each kilohertz of bandwidth. Different types of information signals carried by radio have different data rates. For example, a television (video) signal has a greater data rate than an audio signal.
 Links: a. Data signaling rate b. Carrier wave c. Hertz d. Audio signal

A: c
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Q: Question: In which U.S. state is Perlmutter's childhood neighborhood located? Passage:Perlmutter spent his childhood in the Mount Airy neighborhood of Philadelphia. He went to school in nearby Germantown; first Greene Street Friends School for the elementary grades, followed by Germantown Friends School for grades 7 through 12. He graduated with an AB in physics from Harvard magna cum laude in 1981 and received his PhD in physics from the University of California, Berkeley, in 1986. Perlmutter's PhD thesis titled "An Astrometric Search for a Stellar Companion to the Sun" described the development and use of an automated telescope to search for Nemesis candidates under Richard A. Muller. At the same time, he was using this telescope to search for Nemesis and supernovae, which would lead him to his award-winning work in cosmology. Perlmutter attributes the idea for an automated supernova search to Luis Alvarez, a 1968 Nobel laureate, who shared his idea with Perlmutter's research adviser.
 Links: a. Richard A. Muller b. Mount Airy, Philadelphia c. Richard A. Muller d. List of Nobel laureates in Physics

A: b
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Q: Question: What year was the song that "Ishe Komborera Africa" was selected to replace written? Passage:Following Rhodesia's Unilateral Declaration of Independence from the British Empire, the new Rhodesian authorities started to crack down on African liberation movements. One of their considerations was to ban performance of "Ishe Komborera Africa" in African schools and public performance of it often made people liable for arrest by the British South African Police. The District Commissioner for Gutu abolished the Gutu African Council after its leader opened a meeting by singing "Ishe Komborera Africa" in the District Commissioner's presence. The Commissioner also had the leader arrested but he was released without charge. Following the Southern Rhodesian general election, 1980, after Zimbabwe Rhodesia returned to British control as Southern Rhodesia, Robert Mugabe's Zimbabwe African National Union party won to become the first government of an independent Zimbabwe. After this, "Ishe Komborera Africa" was selected to replace the official "God Save the Queen" of Southern Rhodesia and the unofficial "Rise, O Voices of Rhodesia" of Rhodesia as the national anthem of an independent Zimbabwe as it was a symbol of black African struggles and solidarity against apartheid systems in South Africa and Namibia. At the Zimbabwean independence ceremony, the Union Jack was lowered to "God Save the Queen" and the new flag of Zimbabwe was raised to "Ishe Komborera Africa" in Salisbury.
 Links: a. Rhodesia's Unilateral Declaration of Independence b. Commissioner c. God Save the Queen d. Zimbabwe African National Union

A:
c
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