After Living Together for a Year, Sylvia and Yefim Have

After living together for a year, Sylvia and Yefim have decided to marry. Research on premarital cohabitation most strongly suggests that

A) they have more positive attitudes toward the institution of marriage than the average couple.
B) their marriage will have a higher-than-average probability of being successful.
C) most of their college friends and acquaintances have viewed their cohabitation negatively.
D) their marriage will have a higher-than-average probability of ending in divorce.