Which of the following provides an example of the "Something you don't know you know" method of authentication?

A. Rita uses a device similar to a house key in order to access her personal computer.
B. Chloe touches her index finger to a key pad in order to access the government office where she interns.
C. George uses a pass code that was created based on the way he unconsciously reacted in a video game simulation.
D. Sam uses personal information like his nickname or the city where he was born as passwords for email and websites.