Under what three circumstances might ambulatory care be preferable and why

Ambulatory care is a type of health care in which the patient do not have to be hospitalized; the patient comes to the hospital for treatment and then go back to his house after the treatment. This kind of arrangement will be preferred in the following situations:
1. when the patient do not have much money: ambulatory care are relatively cheaper compared to that of been hospitalized.
2. When the medical facility do not have much resources: ambulatory care will be preferred in order to reduce operating costs.
3. When the medical facility is small: the hospital will prefer to hospitalized only critically ill patients.

The correct answer is  b)