You will be given a definition of a task first, then some input of the task.
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: How many miles long is the river that the water flows to via the the Canacadea Creek valley? Passage:Wellsville is located in the region of the Eastern Triple Divide, the cusp of the three major watersheds in the eastern United States. The Genesee River flows through the center of the village and the town of Wellsville, north to Rochester and Lake Ontario and then on to the St. Lawrence River and the Atlantic Ocean. In the Wellsville school district, in Alma, southwest of Wellsville, Honeoye Creek flows west to Oswayo Creek and then the Allegheny River, then to the Ohio and the Mississippi River, eventually to the Gulf of Mexico. And just over Jericho Hill to the northeast of Wellsville in the town of Alfred, the water flows to the east down the Canacadea Creek valley to the Canisteo River, eventually to the Susquehanna River and on to the Atlantic Ocean.
Links: a. Canisteo River b. Susquehanna River c. Ohio River d. Saint Lawrence River
Output:
a