Which of the Following Do Researchers Use as Evidence Supporting

Which of the following do researchers use as evidence supporting the phrase "opposites attract"?

A) People are more attracted to people whose attitudes are different from their own.
B) People are more attracted to people who have a different MHC compound than they do.
C) People are less attracted to people who have a different MHC compound than they do.
D) People are more attracted to people whose faces are dissimilar to their own.