Step 1: Understanding the Concept:
Sentence rearrangement requires finding a chronological and logical sequence. Participle phrases (like "hearing some sound") often appear at the beginning of a sentence to provide context for the main action.
Step 2: Analyzing the Phrases:
1. (D) "hearing some sound sudden" acts as an introductory participial phrase setting the scene.
2. (B) "she came to the balcony" is the main clause detailing the immediate reaction.
3. (A) "and saw her son in a blue shirt" adds the subsequent action.
4. (C) "surging on the rocking horse" provides a descriptive detail about what the son was doing.
Step 3: Detailed Reasoning:
Putting it together: "Hearing some sound sudden (D), she came to the balcony (B) and saw her son in a blue shirt (A) surging on the rocking horse (C)." This flow follows a perfect narrative arc: cause (hearing sound) $\rightarrow$ reaction (going to balcony) $\rightarrow$ discovery (seeing son) $\rightarrow$ descriptive detail (son's action).
Step 4: Final Answer:
The correct order is (D), (B), (A), (C).