Which airspace includes a Terrain Flight Route for helicopter navigation and pilot training?

The correct answer is associated with the designation of special use airspace that allows for specific activities such as helicopter navigation and pilot training. In this context, R-201 is notable because it is generally established for helicopter operations, including Terrain Flight Routes that facilitate training and operational flights in a controlled environment. These routes are essential for pilots to safely navigate over varied terrain while undergoing training, ensuring effective learning and ridership under oversight.

Determination of the other designations usually comes from their defined usage, which may not emphasize or specifically support helicopter navigation and training objectives as R-201 does. Thus, the classification of airspace reflects its intended use and regulatory conditions, making R-201 the appropriate choice for helicopter Terrain Flight Routes.