What command directs customers to usable exits?

The command "Come this way" effectively directs customers to usable exits because it is straightforward and provides clear guidance. This phrase allows the flight attendant to indicate a specific direction, which can help to alleviate confusion during an emergency situation. The simplicity of the command also ensures it can be understood quickly, which is crucial when time is of the essence and passengers may be feeling anxious or disoriented.

In contrast, other choices may lack the same level of specificity or urgency. Phrases like "Follow my instructions" could create uncertainty as it puts the emphasis on the necessity of further guidance rather than providing immediate direction. "This way to safety" may imply a longer or more complicated route, which is not ideal in an emergency. "Move quickly to the front" might be contextually relevant in some situations, but it does not necessarily communicate that there is an exit available in that direction, which should be the primary goal.