Answer:
d. civil inattention
Explanation:
According to sociology, the term civil inattention is the process where people who don't know each other but that are in close proximity (like in the subway or in a crowded bus) demonstrate that they aware of each other without imposing themselves to the other people. In other words, it's a way of respecting the other person's need for private space when the environment makes difficult to do so.
In this example, ignoring someone out of politeness, who is only inches away from you on a crowded bus would be an example of civil inattention, since you are inches away but you ignore the person as a politeness sign and a recognition and respect of their personal private space.
