How Did Martinez, Lorvick, and Kral (2014) Operationalize the Concept

How did Martinez, Lorvick, and Kral (2014) operationalize the concept "activity space"?

A) Local areas within which people move or travel in the course of their daily activities
B) Using GIS data to determine where participants spent their time over a 6 month period.
C) Asking IDUs to log where they spent their time in a 24 hour period.
D) Checking reception logs at treatment centers to see how often IDUs entered these facilities.

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