Recall the Application About the Link Between Happiness and GDP

Recall the Application about the link between happiness and GDP to answer the following question(s) . Comparing changes in happiness to changes in per capita income over the last 30 years, economists at Dartmouth College and Warwick University have measured levels of happiness in the United States and United Kingdom based on income levels, ethnicity, age, and gender.
-According to the Application, large increases in per capita income in the United States over the past 30 years have

A) had the greatest impact on retired people.
B) not increased happiness levels.
C) led to a higher divorce rate.
D) lowered stress levels.