Sagga, a Researcher Studying Couples Who Have Been Married for 20

Sagga, a researcher studying couples who have been married for 20 years, finds a negative correlation between depression and relationship satisfaction: spouses who are more depressed are less satisfied in their marriages. How might Sagga interpret his findings?

A) Being depressed leads people to become less satisfied with their marriages.
B) Being dissatisfied with one's marriage leads people to become depressed.
C) Some other factor, such as family background, is responsible both for people's levels of depression and for people's relationship satisfaction.
D) All of the above are possible interpretations of Sagga's findings.