Over the Last Few Years, What Correlation Was Found Related

Over the last few years, what correlation was found related to cohabitation rates and financial status?

A) There was an increase in cohabitations rates where both partners were employed.
B) There was an increase in cohabitation rates where one partner was unemployed.
C) There was in increase in cohabitation rates among couples with higher income status.
D) No differences were found between cohabitation rates and financial status.