Given the task definition and input, reply with output. 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: Where is the Celone Airfield? Passage:The squadron arrived in Italy in March 1944 and flew its first combat mission from Celone Airfield on 30 March against an airfield at Imotski, Yugoslavia. It engaged primarily in the strategic bombing campaign against Germany. It attacked targets like marshalling yards, oil refineries and aircraft factories in Austria, Czechoslovakia, Germany, Greece, Romania and Yugoslavia. The squadron was awarded a Distinguished Unit Citation (DUC) for a mission against oil refineries in Ploesti, Romania on 18 May 1944. Clouds that obscured the target resulted in Fifteenth Air Force recalling the mission, but the squadron and the rest of the 463d Group did not receive the recall message and was the only unit to continue on, causing major destruction to the target. Although crippled by intense fighter attacks, they also inflicted severe damage on the opposing air defenses. On 24 May 1945, the 463d Group led the 5th Bombardment Wing in an attack against a Daimler-Benz tank factory at Berlin, Germany. The squadron made a successful attack despite three separate attacks by enemy air defenses, including attacks by German jet fighters. This action earned the squadron its second DUC.
Links: a. Presidential Unit Citation (United States) b. Celone/San Nicola d'Arpi Airfield c. Interceptor aircraft d. Celone/San Nicola d'Arpi Airfield
b