What's inside the apartment: The apartment consists of a bedroom, kitchen, living room, and bathroom. 
In the bedroom, there is a cabinet, coffee table, desk, and sofa. The cabinet houses a water glass, a bag of chips, a condiment bottle, and a dish bowl. The coffee table displays a water glass, a wine glass, and a bottle of wine, while a book rests on the sofa. 
The kitchen is equipped with a dishwasher, eight cabinets, a kitchen table, a fridge, a microwave, and a stove. The dishwasher contains a water glass. The first cabinet is empty, while the fridge stores a plate, an apple, and a salmon. The fifth cabinet holds a bag of chips, and the microwave and seventh cabinet each contain a plate. The eighth cabinet is filled with four dish bowls and a water glass. The third cabinet has an apple, the stove contains a cupcake and a salmon, and the fourth cabinet holds a condiment bottle. The second cabinet contains a plate, and the sixth cabinet is empty. 
The living room features a coffee table, a sofa, and a desk. A bottle of wine sits on the coffee table, and a water glass is placed on the sofa. 
The bathroom is fitted with a cabinet, which is currently empty. 
Actions taken by Mark: Mark is situated in the bathroom. He proceeds to the kitchen, approaches the sixth cabinet, opens it, and subsequently closes it. He then opens the seventh cabinet and closes it as well. Mark moves towards the first cabinet, opens it, and then closes it. He repeats this action with the second, fourth, and third cabinets in succession. Finally, Mark heads towards the bedroom and walks towards a book. 
Question: If Mark has been trying to get a salmon, which one of the following statements is more likely to be true? (a) Mark thinks that the salmon is inside the fridge. (b) Mark thinks that the salmon is not inside the fridge. Please respond with either a or b.