Final answer:
The most likely physical symptom of stress among the given options is ulcers.
Step-by-step explanation:
The most likely physical symptom of stress among the given options is ulcers. Ulcers are sores that form on the lining of the stomach or intestines and can be caused by stress. While warts, ingrown toenails, and hearing loss can have other causes, ulcers are commonly associated with stress.