**Explanation:**

The correct answer is option B, which states that the statement is always false.

The flow of water in a hilly area is not always an example of streamline flow. Streamline flow refers to the flow of a fluid in which the velocity at any given point remains constant over time. In streamline flow, the fluid particles move in parallel paths, and there is no cross-mixing of the fluid particles.

In the case of water flow in a hilly area, several factors can disrupt the streamline flow and make it turbulent. These factors include:

1. **Irregular Terrain:** Hilly areas are characterized by uneven and irregular terrain, which can cause the flow of water to be uneven and turbulent. The water encounters various obstacles such as rocks, boulders, and uneven surfaces, leading to disruptions in the flow and the formation of eddies and turbulence.

2. **Rapid Change in Gradient:** Hilly areas often have steep slopes and rapid changes in gradient. As water flows down these slopes, it gains kinetic energy, which can lead to an increase in the flow velocity. This increase in velocity can cause turbulence and disrupt the streamline flow.

3. **Obstacles and Roughness:** Hilly areas may have vegetation, trees, and other obstacles that can obstruct the flow of water. Additionally, the presence of rough surfaces, such as rocks and gravel, can cause the flow to become turbulent as the water interacts with these irregularities.

4. **Channel Constriction:** In hilly areas, water flows through narrow channels and gorges, which can cause the flow to become turbulent due to the constriction and increased velocity of the water.

Due to these factors, the flow of water in a hilly area is often turbulent rather than streamline. Turbulent flow is characterized by irregular and chaotic movement of fluid particles, with mixing and eddies occurring. Therefore, the statement that the flow of water in a hilly area is an example of streamline flow is incorrect.