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.