Solution:The Delaware Aqueduct is the newest of aqueducts in New York City. It takes water from the Rondout Reservoir through the Chelsea Pump Station, the West Branch Reservoir, and the Kensico Reservoir, ending at the Hillview Reservoir in Yonkers, New York.The Paijanne Water Tunnel located in Southern Finland, is the world's second longest tunnel (after the Delaware Aqueduct in the USA). It is 120 kilometres (75 mi) long and runs 30-100 meters under the surface in bedrock. The purpose of the tunnel is to provide fresh water for the millions of people in Southern Finland in the cities of Helsinki, Espoo, Vantaa, Hyvinkaa, Jarvenpaa, Kerava, Kauniainen, Kirkkonummi, Sipoo, and Tuusula.
Hence, the correct answer is New York city which is not in options. According to commission the correct answer is (a).