What's inside the apartment: The apartment consists of a bedroom, kitchen, living room, and bathroom. 
In the bedroom, there is a coffee table and a desk, with a book and a water glass placed on the coffee table. 
The kitchen is equipped with four cabinets, a fridge, a kitchen table, a microwave, and a stove. The third cabinet from the left is empty, while the second cabinet holds a water glass, and the first cabinet contains a bottle of wine. Inside the fridge, there are three plates and two cupcakes. The microwave houses a salmon, and there is another salmon along with a plate in the stove. The fourth cabinet stores a condiment bottle. 
The living room features a cabinet, a sofa, a coffee table, and a desk. The cabinet holds two wine glasses, a dish bowl, and an apple. On the coffee table, there is a dish bowl, a plate, a wine glass, and a remote control. 
The bathroom is furnished with a bathroom cabinet, which is currently empty. 
Actions taken by Mark: Mark is situated in the kitchen. He strides towards the stove, opens it, and subsequently closes it. He then proceeds towards the refrigerator, opens it, and closes it as well. Following this, he moves towards the fourth kitchen cabinet, opens it, and then shuts it. Finally, he walks towards the microwave, preparing to open it. 
Question: If Mark has been trying to get a water glass, which one of the following statements is more likely to be true? (a) Mark thinks that the water glass is inside the microwave. (b) Mark thinks that the water glass is not inside the microwave. Please respond with either a or b.