Hmm, this is a tough one. I'm leaning towards D, the defect removal efficiency information. That tells you how well your team is doing at catching and fixing bugs, which is key for improving the process.
I would go with option C, the lifecycle phase in which the defect has been introduced. That gives you the best insight into when the issues are being introduced and where to focus your efforts.
The defect component information (B) is definitely the most useful for defect clustering analysis. Knowing where the defects are occurring is crucial for identifying the root causes.
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