Correct answer is C, Advance Deposits.
When people want to stay in a hotel, they usually reserve rooms for them, just to avoid the possible rush. So in this case reservations are made with the hotel. Hotel management prefers Advance payments for the reservation of the rooms. The reason is because if reservation is made confirmed or guaranteed, there is still no payment involved and the reservation can be canceled anytime by the person who made it. And in this case, hotel management cannot do anything. They can even miss other customers who they have to decline for reservation due to early reservation by someone else. So hotels prefer advance payments.