Answer:
d. inevitable; all decline
Explanation:
Aging is part of the natural process that all living thing is inevitably going to pass through in life. It is just like other natural process like respiration, growth e.t.c. There has been a relationship between age and cognitive actions carried out by people.
The most important changes in cognition with normal aging include measures of speed of processing, working memory, and executive cognitive function of the brain. The earlier people get to see that aging is inevitable and cognitive performance is dependent on it, the better