All Other Things Being Equal,who Is Most Likely to Be

All other things being equal,who is most likely to be happy in their long-term relationship?

A) Kyle,who feels like he gets more out of the relationship than his partner
B) Andy,who feels like he doesn't really deserve his partner
C) Yusuf,who is in his relationship primarily to avoid feeling lonely
D) Roger,who feels that his relationship is fair and balanced for both him and his partner