Which Statement Best Describes the Matching Hypothesis

Which statement best describes the matching hypothesis? 

A)  As couples are together longer, their behaviours tend to become very similar. 
B)  People are drawn to others with traits and levels of attractiveness similar to themselves. 
C)  Heterosexual people tend to find a partner who is similar to their opposite sex parent. 
D)  People are more likely to choose partners with opposite characteristics to themselves.