What's inside the apartment: The apartment consists of a bedroom, bathroom, living room, and kitchen. 
In the bedroom, there is a coffee table. 
The bathroom houses a cabinet, which is currently empty. 
The living room is furnished with a cabinet, coffee table, sofa, and desk. The cabinet contains four water glasses, a dish bowl, two apples, a remote control, and a condiment bottle. A wine glass and a bottle of wine are placed on the coffee table. 
The kitchen is equipped with a fridge, stove, kitchen table, and microwave. Inside the fridge, there are three apples, a bottle of wine, and two dish bowls. The stove contains a salmon, a cupcake, and a plate. A condiment bottle is stored in the microwave. 
Actions taken by Robert: Robert is situated in the bedroom. He proceeds towards the kitchen and advances towards the refrigerator. 
Question: If Robert think there isn't an apple inside the fridge, which one of the following statements is more likely to be true? (a) Robert has been trying to get an apple. (b) Robert has been trying to get a salmon. Please respond with either a or b.