Milo and Shirley Are Taking a Trip on a Cruise

Milo and Shirley are taking a trip on a cruise ship for their 20th wedding anniversary.They believe they made it to this milestone because they know each other so well.During the trip they take part in a game show where they find out they don't know each other as well as they thought.However,they still maintain they are very much in tune with the other's needs and thoughts.This is an example of

A) the availability heuristic.
B) belief perseverance.
C) the hindsight bias.
D) the representativeness heuristic.