Detailed Instructions: 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.
Q: Context: The Yellowstone class is a class of four destroyer tenders built by the National Steel and Shipbuilding Company between 1977 and 1982.
Question: The document can be classified to which topic?
Options: 1)Artist, 2)MeanOfTransportation, 3)WrittenWork, 4)Athlete
A:
2