Given the task definition and input, reply with output. In this task, you are given a text which is the body of a document. You are given a question and options. Pick the correct number. Don't generate anything else apart from the numbers provided in options.

Context: The Gasper River is a 38.6-mile-long (62.1 km) river in southwestern Kentucky USA. It flows northeasterly into the Barren River. It is a rural river; the only town near it is Hadley in Warren County. It begins in northeast Logan County and the river also flows through Warren and Logan counties. Tributaries include Belcher Salt Lick Brush Clear Fork Westbrook and Rock House creeks.It is about 40 to 60 feet (12 to 18 m) wide and has a few small rapids.
Question: The document can be classified to which topic?
Options: 1)WrittenWork, 2)Animal, 3)Building, 4)NaturalPlace
4