Final answer:
Anastasia is showing an Escalation of commitment bias by adhering to a past decision despite changes in the situation that make the decision irrelevant. This bias occurs due to the investment of resources such as time, money, and effort already made into the decision.
Step-by-step explanation:
Anastasia, the regional manager, is exhibiting a type of bias known as the Escalation of commitment.
This type of bias occurs when an individual continues to support a past decision despite new evidence suggesting that the decision is no longer optimal or relevant to the current situation.
It is a tendency to invest additional resources in an apparently losing proposition, influenced by effort, money, and time already invested.
The other biases listed, such as Confirmation bias, Anchoring bias, and Hindsight bias, don't apply in the context of supporting a past decision due to investment already made.
Confirmation bias involves focusing on information that affirms one's existing beliefs, Anchoring bias is the reliance on initial information to make subsequent judgements, and Hindsight bias involves the belief that events are predictable after they have already occurred.