Which of the Following Statements Is True About Subjective Class

Which of the following statements is true about subjective class?

A) Since the end of World War II, there has been an increase in the number of Americans claiming to be middle class.
B) Subjective social class is important because it affects feelings of satisfaction.
C) Middle-class people report higher levels of happiness when they perceive a large gap between themselves and people at the higher end of the income distribution.
D) Middle-class people report low feelings of happiness when they perceive a wide gap between themselves and people at the lower end of the income distribution.