**Step-by-Step Solution:**
1. **Identify the Components of Bacterial Flagella:**
Bacterial flagella are primarily made up of three main components: the filament, the hook, and the basal body.
2. **Describe Each Component:**
- **Filament:** The filament is the long, whip-like structure that extends from the surface of the bacterium. It is primarily composed of a protein called flagellin, which is arranged in a helical shape. This structure is crucial for the movement of the bacteria.
- **Hook:** The hook is a curved structure that connects the filament to the basal body. It acts as a flexible coupling, allowing the filament to rotate and thus propel the bacterium.
- **Basal Body:** The basal body is embedded in the bacterial cell membrane and serves as the anchor for the flagellum. It contains the motor that drives the rotation of the filament.
3. **Evaluate the Options:**
- The first option lists "Filament, Hook, and Basal Body," which is correct.
- The second option lists "Basal body, hook, protein subunits," which is incorrect as it does not mention the filament.
- The third option lists "Filament, basal body," which is also incorrect as it omits the hook.
- The fourth option lists "Hook, basal body, or chain of the lipid molecule," which is incorrect because it does not accurately represent the components of the flagella.
4. **Conclusion:**
Based on the analysis, the correct answer is the first option: "Filament, Hook, and Basal Body."
