Answer:
D. Flash robs
Explanation:
The main characteristicof flash robs is that there are Always more than one perpetrators, the number tend to be enough to make everyone working in the store to be overwhelmed. (in most flash robs, the number tend to surpass 20 people)
These perpetrators will make their own organized method regarding their position and target. (often initated to covers the view of camera installed in the store, making it really hard for police to determine which person actually steal and which persons are normal customers)
