The cognitive abilities that declines during adulthood is fluid intelligence.
<h3>Why there is usually a decrease in cognitive abilities?</h3>
There is usually a decrease in cognitive abilities during the adult stage because the body will be becoming weak as well as other cells that is been used for the processing in the mental dimension.
It should be noted that when one is going through the adulthood, then spatial ability, and abstract reasoning will start to decrease and that is the reason most of the adult do usually forget what they already knew before when they were young.
Therefore, option C is correct.
Read more about adulthood at:
brainly.com/question/3522507
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