Final answer:
A) One person
The minimum number of people needed for a stretcher transfer without a slider board is three to ensure patient safety and prevent injury to healthcare workers.
Step-by-step explanation:
In the context of patient care and safety, the minimum number of people needed for a stretcher transfer when not using a slider board is three people. One person is typically positioned at the head of the stretcher to control and guide the movement, while the other two are positioned on either side of the stretcher to lift and support the patient. There are various techniques for stretcher transfers, but the safety and comfort of the patient and the prevention of injury to healthcare workers are the top priorities, which often calls for at least three individuals to manage the transfer effectively and safely.