Geometry

Question Analysis：
This question tests the understanding of invariant points — points that stay the same when reflected across y = x.

Key Concept Explanation:
If a point lies on the line y = x, its coordinates are equal: x = y.
Reflecting such a point swaps the same values, so it stays unchanged.

Step-by-Step Solution：
A. (2, 5) → (5, 2) ≠ original
B. (–3, –3) → (–3, –3) ✅
C. (4, –4) → (–4, 4)
D. (7, 0) → (0, 7)
Only (–3, –3) lies on the line y = x.

Common Mistakes：
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