Determine which of the given figures completes the main figure.
Refer to the file "image_b2c23e.png" for the main figure and options.

By observing the main figure in "image_b2c23e.png", we can see a clear pattern in the lines across the four quadrants:
1. Every quadrant contains a continuous inner border consisting of a horizontal line near the outer edge and a vertical line near the outer edge.
2. In all the given three quadrants (top-left, bottom-left, and bottom-right), there is a diagonal line running from the top-left corner to the bottom-right corner of their respective inner sections.
3. Following this uniform pattern, the missing top-right quadrant must also feature a diagonal line extending from its top-left to its bottom-right corner, along with the corresponding horizontal and vertical inner border lines.

This configuration perfectly matches Option C.