Karen and Pete Want to Live Together

Karen and Pete want to live together.The most important reason they give is to "test the waters" and to see if they are compatible.Does the research support this as the most important reason for cohabitation?

A) no; the most important reason is to spend more time with each other
B) no; research has found the most important reason is that it is cheaper to live together
C) yes; the issue of compatibility is the most important reason
D) for males it is the most important reason; for females it is a matter of economics