According to Denney's Model of Exercised and Unexercised Skills Illustrated

According to Denney's model of exercised and unexercised skills illustrated in the textbook,the maximum level of cognitive and physical function an individual can achieve with exercise

A) is less for the abilities that are routinely exercised and greater for the abilities that are rarely exercised.
B) steadily increases as the individual ages.
C) is determined by social class, gender, and ethnicity.
D) steadily decreases as the individual ages.