Find the part of the sentence that contains an error:
It was not only the scattering of administrative authority across multiple agencies (1)/ that weakened coordinated policy-making, but the rigidity built into intersecting compliance frameworks (2)/ which, though intended to preserve procedural independence, (3)/ end up stalling inter-departmental coordination completely. (4)

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1. **Find the subject:** The noun is **"rigidity"**, which is singular.
2. **Check the verb in (4):** It says **"end up"**, a plural verb form.
3. **Match number:** A singular subject needs **"ends up"**.
4. **Conclusion:** The error is in part (4).  
FINAL_ANSWER: d

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