Which of the following statements is/are true? Group of answer choices A. The conjunction fallacy is the tendency to estimate that the probability of one event (X) is higher than the probability of two events (X and Y). B. The availability bias refers to the tendency to judge events as more likely when they are framed as probabilities (e.g., "a ten percent chance") than as frequencies ("one in ten"). C. On average, people will pay more for (a) a $50 gift certificate than (b) a 50% chance of receiving a $50 gift certificate and a 50% chance of receiving a $100 gift certificate. D. Two of the above