Geometry

Question Analysis:
This question requires proper application of triangle naming protocols when given specific congruent parts.

Key Concept Explanation:
Congruency statements must preserve:
Angle congruency
Side congruency
Corresponding vertex order

Step-by-Step Solution:
Given conditions:
∠P ≅ ∠S ⇒ P↔S
∠Q ≅ ∠T ⇒ Q↔T
PQ ≅ ST ⇒ P↔S, Q↔T
Therefore R must correspond to U
Only option B maintains this correspondence

Option Analysis:
A) Incorrect - R would correspond to R (invalid)
B) Correct - maintains P↔S, Q↔T, R↔U
C) Incorrect - scrambles correspondence
D) Incorrect - ...