Geometry

Question Analysis：
This question focuses on correctly applying the rule of reflecting a single point with a zero in one coordinate.

Key Concept Explanation:
When reflecting over y = x, swap the coordinates: (x, y) → (y, x).
Signs remain the same from the original values.

Step-by-Step Solution：
Original: (0, −9)
Swap x and y → (−9, 0)

Option Analysis：
A. Incorrect — sign and position wrong
B. Incorrect — sign flipped
C. ✅ Correct — values swapped accurately
D. No reflection — sa...