Vacationing on a motorcycle, you see things in a way that is completely different from any other. In a car you are always in a compartment, and because you are used to it you do not realise that through that car window everything you see is just more TV. You are a passive observer and it is all moving by you boringly in a frame. On a motorcycle, however, the frame is gone. You are completely in contact with it all. You are in the scene, not just watching it anymore, and the sense of presence is overwhelming.
"In a car you are always in a compartment, and because you are used to it you do not realise that ......... " In this sentence, 'it' refers to

Options

A. travelling in a car.
B. always being in a compartment, e.g. one's room, office
C. seeing the scenery through the window frame.
D. seeing so much TV at home