Arthur Rubinstein, a renowned pianist, continued to give award-winning performances into late adulthood. He did this by sticking with the range of pieces he felt most comfortable, practicing more, and...

Arthur Rubinstein, a renowned pianist, continued to give award-winning performances into late adulthood. He did this by sticking with the range of pieces he felt most comfortable, practicing more, and playing the slow passages very slowly just before the fast passages so that the fast pieces sounded that much faster. This is an example of

 a. improved procedural memory with age.

 b. better divided attention among experts.

 c. selective optimization with compensation.

 d. faster reactions times of older experts compared to their younger counterparts.