Task: Text Completion
Input (English): [header] How to use social distancing for retail businesses in pandemic [title] Set up a mobile queuing system. [step] It can be manual or automated with an application. [title] Issue a queue number to a waiting customer. <sep> (A) [title] Take a customer's order to start the queue. [step] The queue number will then be displayed to the right when a customer gets on line or enters the middle of the line. (B) [step] You will then receive a notification when the queueing process is complete. [title] Decide how to choose a queue option. (C) [title] Send the final customer a significant text message and ask them to register for an application. [title] Assign who will register and name the queue number. (D) [title] Ask the customer to wait nearby safely and ask the customer not to return until alerted. [title] Alert the customer in advance to give them time to return for service.
Output (English): D