Answer: A) Clothing should be added to the washer after the detergent is added.
Step-by-step explanation: in the given scenario we can see the instructions to use the washing machine at a self-service laundry. From the given options, the direction that is true (according to the text) is the corresponding to option A: Clothing should be added to the washer after the detergent is added, we can see that in the line "Once water is flowing, add detergent, then add clothing and other items to be washed."