Marriott Hotel, a 5-star hotel chain, offers customer loyalty program - the Marriott Rewards which encourages business guests to earn points to increase their status, and get even more reward benefits ranging from Silver, Gold and Platinum Elite levels. The qualifying nights per year for Silver, Gold and Platinum Elite levels are 20, 50 and 80 nights respectively. From the perspective of hotel room pricing, what are the psychological influences?

A. Switching and shared cost effects.

B. Framing and anchoring effects.

C. Difficult comparison and end benefit effects.

D. Reference price and overconfidence effects.