Given the task definition and input, reply with output. 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.

Question: How long is the Santo Domingo River? Passage 1:The Sierra Juarez is a range of mountains in Oaxaca state, Mexico between latitudes 1720'-1750'N and longitudes 9615'-9700'W, with an area of about 1,700km (656 sq mi). It is part of the Sierra Madre de Oaxaca. The range is separated from the Sierra de Zongolica to the north by the Santo Domingo River, flowing through the Tecomavaca Canyon. It stretches south-eastward to the Cajones River and the Sierra de Villa Alta. The mountains are in the district of Ixtlan de Juarez in the Sierra Norte de Oaxaca region. The range is named after Mexico's only indigenous president, Benito Juarez, who was born here in 1806 in the small village of San Pablo Guelatao. The heavily wooded area is about from the city of Oaxaca on Federal highway 175, heading towards Tuxtepec.
Passage 2:Ethlyn Eugenie Smith was born on 23 April 1940 in the village of Huntums Ghut, on the island of Tortola, at the time a British colony known as the British Leeward Islands to Gladys and Ernest Smith. She completed her primary and secondary education in the islands and worked briefly as a clerical trainee in the civil service of the island. To further her education, she pursued an associates degree from the College of the Virgin Islands in Charlotte Amalie, in the U. S. Virgin Islands. She completed her degree program in accounting in 1968 and went on for further studies at Wandsworth Technical College in London and at the University of Calgary. She graduated from Calgary in 1970 with a bachelor's degree in accounting. During her schooling the country was decolonized and became the British Virgin Islands (BVI), one of the dependencies of the British Overseas Territories.
Passage 3:Reisinho was born in Vila Nova de Gaia. He began his career in 1988 when he signed a youth contract with Primeira Liga club Porto. Over the next five years, he progressed through their youth team and was capped at international level for Portugal. He played 15 times for the under-16's and three times for the under-17's, scoring one goal. He moved to Penafiel of Liga de Honra in 1993, where he made his first team debut. He made 20 appearances in his first season with the club before joining Felgueiras on loan in 1994. The following year, he moved to Leca on loan and made four appearances in the Primeira Liga before finishing the season back with Penafiel. Reisinho was transferred to Marco in 1996 and played for another two years in Liga de Honra, scoring four goals in 52 appearances. He joined another Liga de Honra club in 1998, Pacos de Ferreira, and made 46 appearances over the next two seasons, scoring nine times. He returned to Marco for the 200001 season, scoring one goal in nine appearances, and then travelled to England for a trial with Football League club Plymouth Argyle.
1