B) at the beginning he is concerned with only his own world but by the end he is cognizant of other words .
Explanation:
In "Exhalation" we meet a scientist that is dedicated to his work. Initially, his only concern was to perform scientific research as part of his work. However, as he continues to do so, he begins to realize that his research can potentially have an impact not only on the way his world operates, but on his understanding of other worlds. As he realizes the significance of what he is learning, he becomes cognizant of other worlds and their struggles.
