According to the Study Guide PowerPoints, Which Item Below Is

According to the study guide PowerPoints, which item below is not one of the reasons the text states that it is the "best of times" for humanity.

A) Physical improvements have occurred because of better nutrition and health care for all groups.
B) All humans worldwide have experienced increases in average life expectancy.
C) Although disparities exist in income and wealth, all groups have experienced increases in access to material goods.
D) There has been a decrease in cancer.