Definition: In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.
Input: Question: Who led the group that launched a major assault on Korenica and Udbina? Passage 1:Sweden ( ), officially the Kingdom of Sweden ( ), is a country in Northern Europe. It borders Norway to the west and north and Finland to the east, and is connected to Denmark in the southwest by a bridge-tunnel across the Oresund Strait. At , Sweden is the largest country in Northern Europe, the third-largest country in the European Union and the fifth largest country in Europe by area. The capital city is Stockholm. Sweden has a total population of 10.3million of which 2.5 million have a foreign background. Persons who have foreign backgrounds are defined as persons who are foreign born, or born in Sweden with foreign born parents. It has a low population density of and the highest urban concentration is in the central and southern half of the country.
Passage 2:Mews attended the University of Auckland and completed BA and MA degrees there in History. He carried out doctoral study at the University of Oxford, followed by five years (19801985) teaching British civilisation at the Universite de Paris III, while pursuing studies in medieval thought (focusing on Peter Abelard) in connection with Jean Jolivet, at the Ecole pratique des hautes etudes en sciences religieuses. This was followed by two years as a Leverhulme research fellow at the University of Sheffield on editing the writings of Peter Abelard. Mews took up a position at Monash University as Lecturer in the Department of History in July 1987. He became involved in developing the Centre for Studies in Religion and Theology and in promoting studies in religion more generally, with a strong interest in interfaith work. He has had spells of study at the Institute for Advanced Study, Princeton, in 1990 and 2000, and has also again taught in Paris, at the Ecole pratique des hautes etudes (Ve section) and in the Ecole des hautes etudes en sciences sociales.
Passage 3:From May, 1941, it was transferred to an occupation force in Croatia. The battles with Yugoslav Partisans of increasing intensity were fought in NovemberDecember 1941 at Stirovaca forest, Divoselo (Croatia), and Zuta Lokva, resulting ultimately in the Battle of the Neretva. It was fought initially at Gospic, Otocac and Bihac. The Yugoslav Partisans has launched a major assault on Korenica and Udbina from 2 January until 15 January 1942. These attacks were fended off by division Re, and in FebruaryMarch, 1942, it participated in the mopping-up operation in the same area. The culmination of Battle of the Neretva for division Re was the Operation K, between 23 28 March 1942, carried out over six days by the Italian V Corps. The objective was to break through to and relieve the surrounded garrisons in Titova Korenica, Udbina and Donji Lapac the operation was successful and the division suffered only light casualties. In April, 1942, the Yugoslav Partisans has launched an assault on Mogoric and Bihac. Pressure was such what he garrison of Bihac had to be evacuated in June, 1942. All lost positions were recovered by the end of June, 1942, after fierce fighting.

Output:
3