The federal criminal law is contained in:

The federal criminal law is primarily contained in Title 18 of the U.S. Code. This title encompasses various offenses and penalties that fall under federal jurisdiction, including serious crimes such as robbery, terrorism, and fraud, as well as procedures for federal criminal prosecutions. Title 18 is critical for understanding how federal laws apply to criminal behavior, including jurisdictional issues and the enforcement of these laws by federal agencies.

To further clarify, other titles of the U.S. Code focus on different areas of law. For example, Title 1 includes general provisions about the U.S. Code itself; Title 12 pertains to banks and banking; and Title 20 deals with education. Therefore, Title 18 stands out as the specific title dedicated to federal criminal law, making it the correct choice in this context.