Which of the Following Statements About the Relationship Between Income

Which of the following statements about the relationship between income marital happiness is (are) supported by the results in Chapter 9?

A) Social class affects marital happiness but a change in income does not.
B) A change in income affects marital happiness but social class does not.
C) Both social class and a change in income can affect marital happiness.
D) Neither social class nor a change in income are likely to affect marital happiness.