Which of the following is the best explanation why some middle-age people have some long-term memory loss?
a) Middle-aged people have too much information stored: therefore, it is difficult to keep it all in long-term memory.
b) Middle-aged people have too much stress in their lives, which impedes their ability to use their long-term memory capacity.
c) Middle-aged people have less efficient retrieval skills for finding and retrieving information, even if the information was adequately stored in long-term memory.
d) Middle-aged people's learning genes begin to deteriorate, which leads to long-term memory loss.;