For participants who are in middle adulthood, research has shown a slight decline in

Research has determined that there is a slight decline in short-term memory ability during middle adulthood.

This happens because during this stage of life, a lot of people seldom do activities that exercises their mind and memory like sudoku. A decrease in these activities makes the mind underutilized, thus decreasing its capability.

can you explain it better

answer; ///i believe the correct answer is the empire state building;