What is generally true concerning family income and happiness? a. there is a huge difference in happiness between those who have family incomes of $70,000 and those who make more than $100,000 a year. b. as average income rose from 1955 to 1995, the number of very happy people rose sharply. c. money cannot buy us as much happiness as our culture has led us to believe. d. people with family incomes of more than $200,000 are unhappier than those who make less than $20,000.