Answer:
C. Arrival time of patients.
Step-by-step explanation:
Flow time is a term used in business operations to describe the quantity of period or duration a flow unit such as the number of customers attended to, commodities produced, etc, consumes in a business operation from start to finish. It can be calculated by the formula T = I/R
Where T = Flow time, I = average inventory, R = number of customers attended to / time period
Hence, in this situation, the information that is needed to compute flow time at a dentist's office is option C Arrival time of patients.