Answer:
b. lowball technique
Step-by-step explanation:
Lowball technique: In psychology, the term lowball technique is referred to as the phenomenon of persuasion tactic that is distinguished as an item being offered at a lower price to a buyer till he or she excepts buying the thing and once the buyer gets convinced or committed to buy the thing or product then the seller rises or increases the price suddenly.
Example: In the question above, car dealer offered a handsome deal to a customer, then once the customer agreed or committed to buy the car the dealer increases the price by some hidden costs.