In "The Ties That Bind Are Fraying," McPherson and His

In "The Ties That Bind Are Fraying," McPherson and his colleagues found that

A) those with lower incomes are more involved in their communities than are the most affluent.
B) over the time period they studied, 1940 to 1995, older people developed more social ties.
C) over the time period they studied, 1990 to 2015, young people developed more social ties than any other group.
D) there is "inadequate social support" for about half of all American adults.