Final answer:
The most challenging activity for a client with mild (stage III) Alzheimer's disease would likely be remembering recent events due to the progressive memory loss associated with the disease.
Step-by-step explanation:
The activity that would be the most difficult for a client with mild (stage III) Alzheimer's disease is likely remembering recent events. One of the hallmark symptoms of Alzheimer's is disruptive memory loss, particularly with recent memories, due to the degeneration of brain cells. As the disease progresses, individuals face increasing challenges with memory tasks. For example, tests that involve memory, such as the three-word recall test, can be problematic, requiring patients to recall words after a short interval or perform tasks like reciting the months of the year in reverse to gauge memory strength.
While engaging in physical exercise or solving puzzles may still be possible with some level of support, and following a routine medication schedule may be aided by tools like medication dispensers, the act of recalling recent events is likely to be considerably more challenging without such aids, reflecting the cognitive impairments typical of this stage of Alzheimer's.