A 19-year-old woman who prefers not to take medication uses a diffuser with lavender essential oil to help her calm down and fall asleep at night. Which biologically based therapies is she using?

Choice A reason: Herbal therapy involves ingestion of plant-based remedies, whereas this patient is using inhalation for relaxation. Choice B reason: Supplements refer to ingestible vitamins or minerals, not inhaled essential oils. Choice C reason: Vitamins are micronutrients taken orally for nutritional purposes, not for relaxation via olfactory stimulation. Choice D reason: Aromatherapy uses essential oils to promote physical and psychological well-being through scent, which is exactly the method employed by this patient.