Geometry

Question Analysis:
Requires identifying an isometry that maps one triangle onto another based on coordinates.

Key Concept Explanation:
Reflection over y-axis: (x, y) → (−x, y)
Check if original x-values are negated.

Step-by-Step Solution:
Compare A → A′: (−4, 1) → (4, 1) ✅
B → B′: (−2, 3) → (2, 3) ✅
C → C′: (−4, 5) → (4, 5) ✅
→ All x-values change sign, y-values same → y-axis reflection

Option Analysis:
Only B gives ...