What Is the Thesis of Corey Abramson's the End Game

What is the thesis of Corey Abramson's The End Game: How Inequality Shapes Our Final Years (2017) ?

A) Social factors such as poverty and exposure to stress and violence shorten the lives of poor people.
B) By the time they die, most people are psychologically prepared to do so.
C) If poor people make it to old age, they are actually more likely than rich people to make it to very old age (over 100 years) .
D) Poor old people age with less difficulty and pain compared to wealthy old people, because they have developed resiliency and grit in the face of obstacles over the course of their lives.