I NEED HELP PLEASE THIS IS DUE IN 10 MINUTES IT IS FORENSIC SCIENCE
A criminal profiler discovers that an unknown serial killer selects his victims from local yoga classes, and there is evidence that the killer may follow the victim for several days before they are killed. What is this an example of?

Post-offense behavior
Method and manner
Body disposal
Antecedent

I assume its either antecedent or method and manner. I'm leaning towards antecedent but I am just not sure.