Answer: Hindsight bias
Step-by-step explanation:
Hindsight bias is the bias in which people tend to over-emphasize their ability of prediction about any situations outcome that could not have easily been predicted. They tend to show that they knew about the outcome all along
According to the question ,hindsight bias is shown through case where friends were unsure that marriage of Loonie and Burt would last and when they actually got divorced, friends were overestimating their skill that this outcome prediction from the beginning.