Theories that view depression as a group of learned responses are called theories.

A. Severe, prolonged depression has been shown to increase a person's risk for physical illness. Chronic depression can lead to or exacerbate a range of health issues, including cardiovascular disease, weakened immune function, and gastrointestinal problems. The stress and physiological changes associated with depression can contribute to poorer health outcomes and a higher incidence of physical illnesses.
B. Severe, prolonged depression does have an effect on physical health, and the impact is generally detrimental rather than neutral. Ignoring the link between mental health and physical health overlooks the extensive evidence showing how chronic depression can affect physical well-being.
C. Severe, prolonged depression does not typically decrease the risk of physical illness. Instead, it generally increases the risk due to the negative effects on the body’s systems and overall health.
D. Severe, prolonged depression has more than just a little effect on physical health. Its impact is significant and can lead to a range of physical health problems, including increased susceptibility to infections, chronic diseases, and other health complications.

A. This is a premature conclusion. While Alzheimer's disease is a possibility, it's essential to rule out other potential causes before making a diagnosis.
B. A comprehensive evaluation can help identify the underlying cause of the symptoms, which could be Alzheimer's disease, other forms of dementia, or even treatable conditions like vitamin deficiencies or thyroid problems.
C. Admission to a nursing home is premature and may not be necessary. The appropriate level of care will depend on the diagnosis and severity of the symptoms.
D. While some memory changes are normal with aging, the described symptoms are more severe than typical age-related forgetfulness. It's important to investigate the cause to determine if there are any underlying medical conditions or cognitive impairments.