The crime of fraud refers to the act of defrauding large amounts of public and private property for the purpose of illegal possession by using fictional facts or concealing the truth. According to the above definitions, Which of the following can constitute fraud:. ['A pretends to buy a suit in a shopping mall, and the salesperson B asks him to try it on. A puts on the suit and claims to look in the mirror. While B is receiving other customers, he sneaks away.', 'The person in charge of a gas station makes a big profit by making a fool on the meter, so that the actual amount of gas is less than the number displayed on the machine.', 'When A sold his villa at a low price, he concealed the fact that a homicide had occurred in it, and caused B to buy without knowing it.', 'A sales lady A sells the real estate at the subway entrance to client B, saying that there is a lot of room for appreciation of the real estate. Two months after buying the house, the house price plummets, causing heavy losses to B.']