https://file.aiquickdraw.com/mathbot/file/1726747932393lirv1w0n.jpg

To solve this problem, we need to determine which line in the graph has a **zero gradient**.

- A line with a zero gradient is **horizontal** because the slope (or gradient) is the change in \( y \) over the change in \( x \), and for a horizontal line, the \( y \)-coordinate stays constant while the \( x \)-coordinate changes.
  
Looking at the provided graph:
- **Line C** (the blue line) is horizontal, running along the \( x \)-axis. Since it has no change in the \( y \)-coordinate as \( x \) changes, it has a **zero gradient**.

### Final Answer:
- The line with a zero gradient is **Line C**.

Would you like further details on gradients or have any questions? 

Here are 5 related questions to explore this concept further:
1. What does it mean when a line has a positive gradient?
2. How can you calculate the gradient of a line given two points?
3. Which line in the graph has a negative gradient?
4. What is the gradient of a vertical line, and how is it different from a horizontal line?
5. How does the steepness of a line relate to its gradient value?

**Tip**: The gradient of a line is the measure of its steepness; horizontal lines have a gradient of zero, while vertical lines have an undefined gradient.

Learn how to identify a line with a zero gradient from a given graph. This problem introduces basic concepts of gradients, focusing on the relationship between slopes and line orientation. Suitable for students in Grades 6-8.

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