The correct answer is B. a user manual.
Here's why:
1. A news report presents information about current events or news stories.
2. A textbook provides educational content on a particular subject.
3. A history book narrates events from the past.
4. A user manual, on the other hand, is a functional text designed to guide users on how to operate a device, use a product, or perform a task effectively. It is structured in a way that gives step-by-step instructions, troubleshooting tips, and other practical information to assist the user.
In this context, a user manual stands out as the functional text among the options provided as it serves a specific purpose of helping users understand and use a product efficiently.
