Explanation:

- The sentence discusses why there is a strong need for surveillance reform.

- Urgent: Indicates something requiring immediate action or attention. This word fits well in the context as it emphasizes the pressing need for reform in surveillance.

- Diligent: Relates to careful and persistent work. It doesn't suit the context of immediate necessity.

- Cognizant: Means being aware or knowledgeable. While awareness is necessary, it doesn’t convey the urgency of the situation.

- Intelligent: Refers to having a high level of mental capacity but doesn't align with conveying urgency.

- Convergent: Means coming together, implying a merging process, which doesn't fit the context.