The answer is D i.e. Death. The terminal decline phenomenon involves a decrease in mental ability that accompanies the approach of Death.
The expansion in death rates among more seasoned individuals after the arrive at a daily existence achievement, for example, a birthday gives proof of abbreviated telomeres. The method involved with ageing relies upon the shortening of telomeres. The telomeres continue to help increasingly short through the course of life as the cells include themselves during the time spent duplicating and yet again replicating. The telomeres make it workable for the cells to duplicate themselves without adhering to one another as they structure the closures of the chromosomes
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