What Did Studies of Couples Who Remained Married for 50

What did studies of couples who remained married for 50 years find?

A) Younger couples tended to be less negative than older ones when they tried to resolve conflicts.
B) Unhappy couples tended to become happier the longer they lived together.
C) Both happy and unhappy couples believed that divorce was not an option.
D) Couples usually did not share a vision of what their life together should be.