Answer:
A. She is reacting to a new medication her doctor recently prescribed.
Explanation:
Psychologically, the medication works differently in older adults. Adults who are mostly above 65 years old are faced with side effects from the medications. These side effects may include memory loss, falls, weaknesses, etc.
This happens because in older adults medication takes a longer time, compared to other age groups, to break down and get absorbed.
So, the correct answer is option A.