Which of the following is an example of the unit bias?

A) buying a second bottle of soda because the store has a "buy one, get one free" sale
B) adding more sugar to a cup of coffee because it is bitter
C) asking for a second helping of pasta
D) eating more chips in one sitting from a "jumbo" bag than a regular size bag

Answer: D
Rationale: The unit bias is the tendency to assume that the unit of sale or portioning is an appropriate amount to consume. In this example, a person is likely to eat more chips from a large bag than a small bag, because the large bag suggests that one serving of chips is larger.