23) E

1 – Correct
Since the target area had been installed with CCTVs, it is important to see whether the criminals had shifted their location of crimes to nearby areas.

2 – Wrong
Statement 2 is irrelevant to the buffer area idea.

3 – Correct
The data from the buffer area would help us to understand whether the CCTV had caused the fall in crime or if it was more of a general trend.

Since only statements 1 and 3 are correct, E is the answer.

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