Which Statement Best Represents the Findings of Research on Personality

Which statement best represents the findings of research on personality characteristics and marriage in later adulthood?

A) In later adulthood, marriages have more conflict than earlier.
B) It is preferable for both partners to have different personality characteristics.
C) Similarities between conscientiousness and extraversion predict marital satisfaction.
D) Differences between conscientiousness and extraversion predict marital satisfaction.