I believe the answer is: <span> C. hyperbaric oxygen treatment
</span><span> hyperbaric oxygen treatment is aimed to improve the patient's natural healing process by exposing the patient to oxygen at greater pressure that normal people usually experience. This treatment is most commonly used as side treatment for autism, diabetes, or monoxide poisoning.</span>
Answer:
Whether a survey takes the form of a questionnaire or an <u>interview</u> , it may contain both <u>Closed-ended</u> and open-ended questions.
:)