Research has found that cohabitation prior to marriage

Increases the likelihood of divorce

Explanation:

Cohabitation : Cohabitation is when couples or two partners decides to live together in an apartment or house for long term before marriage and tries to find out whether they are compatible with each other before they are legally bind as husband and wife.

                     Researchers have found that people those who cohabits are most likely to divorce and person those who do not live together before marriage. This is because while they live together before marriage, most of the couple finds that they are not compatible with each other or do not coordinate with each other.

                    They find differences in their thoughts, views and expressions. Eventually they end up in quarrels and fights and most out of these couples takes their relation ship into divorce.

                   Thus live in together before marriage helps the couple to decide whether they can live with each other throughout their life and whether is compatibility or understanding between them.

Hence the answer is ---

Increases the likelihood of divorce

you should think about the answers you give and expect the same form your questions.