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 old was Snow Chief in the 1986 Kentucky Derby race? Passage:Solis' first rode in the Kentucky Derby in 1983 on a longshot named Current Hope, and did not place in the money. He rode the Derby again in 1986 on Snow Chief, who had won the Santa Anita Derby and was the morning line favorite, but again finished well back. The horse and rider went on to with the Preakness Stakes that year, marking Solis' only win to date in an American Triple Crown race. He was third in the 1991 Derby on Mane Minister, and also third in the Belmont Stakes on the same horse. Solis finished second in the Kentucky Derby and third in the Preakness with Captain Bodgit in 1997, second in the Derby with Victory Gallop in 1998 and second in both the Derby and the Belmont with Aptitude in 2000. His first Breeders' Cup win was the 2000 Breeders' Cup Sprint on Kona Gold. He won two Breeders' Cup races in 2003 with Johar (who finished in a dead heat) in the Breeders' Cup Turf, and the Breeders' Cup Classic on Pleasantly Perfect, both trained by Richard Mandella. He ended 2003 ranked fourth nationally in purse earnings with a career-best $16,304,252.
 Links: a. Breeders' Cup Turf b. Santa Anita Derby c. Snow Chief d. Richard E. Mandella
c

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
c

Question: When was the first time the award Kabanov received on 30 January 1944 given out? Passage:Kabanov fought in combat from October 1943. He became an Ilyushin Il-2 pilot in the 7th Guards Attack Aviation Regiment of the 230th Assault Aviation Division. In November 1943, he flew sorties during the Kerch–Eltigen Operation. On 14 November he was wounded in the leg. On 22 January 1944 he flew in a raid on trains on the Vladislavovka-Kolodez section of the railway in the Kerch area. During the mission, three trains were attacked and 21 cars were set on fire, of which one contained ammunition. For his actions Kabanov received thanks from the commander of the 4th Air Army. On 27 January, Kabanov flew in a sortie with three other Il-2s to attack German tanks in the area of Skosiyev-Fontan. During the mission a shell fragment hit the oil cooler of Kabanov's plane but he reportedly did not turn back until the mission was accomplished. On 30 January he was awarded the Order of the Red Star. In April and May 1944, Kabanov fought in the Crimean Offensive. On 15 June he was awarded the Order of the Patriotic War 1st class. After the end of the Crimean Offensive the 230th Division was transferred to fight in Operation Bagration. During the June and July 1944, Kabanov participated in the Mogilev Offensive and the Bialystok Offensive. On 20 July he was awarded the Order of the Red Banner. In August he fought in the Osovets Offensive. On 20 September he received a second Order of the Red Banner.
 Links: a. Order of the Red Star b. Kerch c. Operation Bagration d. Order of the Patriotic War

a