People who live in are least likely to relay a phone message, mail lost letters, cooperate with survey interviewers, do small favors, or help a lost child.

This question is missing the options. I've found the complete question online. It is the following:

People who live in are least likely to relay a phone message, mail "lost" letters, cooperate with survey interviewers, do small favors, or help a lost child.

A. big cities

B. small towns

C. rural environments

D. apartments

People who live in A. big cities are least likely to relay a phone message, mail "lost" letters, cooperate with survey interviewers, do small favors, or help a lost child.

Explanation:

It is more common for people who live in big cities to not have the sense of community that people from smaller towns and rural areas seem to possess since childhood. Having more people around us does not mean we get to be friends with all of them. Quite the contrary, it is more isolating than having fewer people. While in smaller towns, inhabitants get to know each other's family for generations on end, watch each other's children grow and marry to have their own kids etc., in big cities we often don't know who our neighbors are. We do not know if we can trust the person living across the hall. Even if we are not physically isolated, we are very much so psychologically and emotionally. That makes it more difficult for us to want to relay a phone message, to cooperate with interviewers, to do small favors and so on. We are "busy" taking care of our own lives. Since nobody seems to be concerned about us, it is easier to not be concerned about them either.