The answer is B: arrogant.
Someone who is arrogant will show a tendency to exaggerate one´s own worth or importance in a way that is unwelcoming, invasive, or frankly exasperating. The three ways that the question addresses someone who is arrogant clearly describe this kind of character. First, a pompous person would be one that grants him or herself more importance than perhaps befits that person. Second, an aloof character would be one that is distanced; in this case it would be one that is distanced from reality, in the sense that that person is too distanced of him or herself to be a good judge of his or her own character´s worth. Finally, domineering would be a kind of character that exercises arbitrary control over others; in this case, it would be the kind of control that an arrogant person would arbitrarily exercise over others based on his or her own self-worth, which is, as it can be seen above, not justified.