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: Onward Muslim Soldiers: How Jihad Still Threatens America and the West published in October 2003 is a nonfiction book by Robert Spencer. Spencer described the book as an in-depth study of the doctrine of jihad and how it is exploited today by terrorists to justify what they're doing and to recruit and motivate new terrorists.
Question: The document can be classified to which topic?
Options: 1)Plant, 2)Artist, 3)Building, 4)WrittenWork, 5)MeanOfTransportation
A:
4