Which of the Following Is an Example of a Relationship

Which of the following is an example of a relationship that reflects complementarity?

A) Joan and Janet are identical twins who look so much alike that even their own parents often mistakenly refer to one of them with the other's name.
B) Sunil joined a local environmental club and during his first hiking event he walked for miles alongside Jamie. They quickly became good friends.
C) Emily works full time to help pay for college, which leaves little time or money to pursue her passion for travel. When she meets Jacques, an international student who has traveled throughout Europe, she enjoys listening to his adventures.
D) Daphne grew up in an ideologically progressive home where both of her parents were active in local politics. When her history professor assigns her to complete a project with Larry, who grew up in an ideologically conservative home with a worldview diametrically opposed to her own, she finds every communication challenging.