Final answer:
The bias represented in this choice is called a loss aversion bias, which is the tendency to strongly prefer avoiding losses over acquiring gains.
Step-by-step explanation:
The bias represented in this choice is called a loss aversion bias. Loss aversion bias is the tendency to strongly prefer avoiding losses over acquiring gains. In this scenario, the contestant decides to walk away and keep the $20,000 winnings because they are averse to the possibility of losing it all. They prioritize avoiding a potential loss over the chance of doubling their winnings.