The answer is letter C.
As we age
the connection of our motor nerves to our muscle fibers tend to deteriorate.
When this happens we tend to lose our balance and coordination as well as our overall
muscular strength and endurance through time. This explains why we cannot
perform some activities that we do when we were younger when we turn into
adults. The brain is already having a hard time to recruit the necessary
stimulus to be sent to the muscle fibers to perform necessary actions. This is why the human body is always
compared to a ticking clock where any moment it could just give up because of
its deteriorating nature.
