Delfina has set up a booth at a food and wine trade show. Delfina is giving away samples of her restaurant's most popular dish, but she wants to only give free samples to peolle who might buy her food. Thus, Delfina looks at everyone who passes by and employs the __________ bias to decide which people might be customers.
a. escalation of commitment
b. anchoring and adjustment
c. hindsight
d. categorical thinking