Step 1: Understanding the Concept:
Sentence rearrangement requires finding a logical subject, a matching verb, and coherent transitions between phrases.
Step 2: Detailed Explanation:
- Part (C) "the growing importance of social rights for children" is a strong opening noun phrase (Subject).
- Part (A) "can be seen as..." follows naturally as the verb phrase explaining the subject in (C).
- Part (B) provides the specific example/starting point "starting with the Factory Acts...".
- Part (D) "children from unrestricted exploitation" logically completes the thought of what the Factory Acts "protected" (from part B).
- Sequence: (C) Subject $\rightarrow$ (A) Verb/Predicate $\rightarrow$ (B) Context/Example $\rightarrow$ (D) Completion of clause.
- Full sentence: "The growing importance of social rights for children can be seen as an extension of citizenship, starting with the Factory Acts of the 1840s which protected children from unrestricted exploitation at work."
Step 3: Final Answer:
The correct logical sequence is (C), (A), (B), (D). Therefore, option (D) is correct.