In martin innes's study of investigation techniques, he found that police rely heavily on that includes canvas of neighborhoods, interviews with friends/family, and constructing victim/suspect timelines to solve a crime.

The correct answer would be, General Coverage.

Explanation:

Martin Innes is a professor at the Cardiff University in the school of social sciences. He leads the University's Police Science Institute. He is considered one of the world's biggest thinker in Policing.

According to his studies on Investigating Techniques by Police, he found that police rely heavily on the General Coverage that includes canvas of neighborhoods, interviews with friends/family, and constructing victim/suspect timelines to solve a crime.

General Coverage may help the Police to find out the true colors of the victim or suspect. By interviewing the neighbors, friends, family, and also reviewing his timeline would help them a lot in understanding the mental state of the person, which eventually will help them in solving the problem.

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a is the answer because it just is