Final answer:
Loss of bladder and bowel control occurs in the severe stage of Alzheimer's Disease, which is Stage 4, caused by extensive damage to the nervous system.
Step-by-step explanation:
The loss of control of bowel and bladder functions is generally associated with the severe stage of Alzheimer's Disease, which would correspond to Stage 4. This stage is marked by a significant increase in neurological impairment, leading to the loss of basic physiological functions. Considering the progression of the disease, the symptoms such as memory loss, difficulty walking, and trouble with bladder control relate to the advanced damage to the nervous system and the resulting inability to regulate other organ systems. In severe Alzheimer's Disease, patients may not recognize family members or communicate and are entirely dependent on others for care. The full dependence on others for care and the loss of control over basic functions, like bladder and bowel control, are indicative of Stage 4 Alzheimer's Disease.