The correct answer is D. His miserable behaviour and rural background.
A. His selfishness is not necessarily a reason for not having affinity with someone. There are many selfish people who are still likable and have friends.
B. His religious faith is also not necessarily a reason for not having affinity with someone. There are many people of different faiths who are still friends.
C. His social rejection is not necessarily a reason for not having affinity with someone. There are many people who are socially rejected who are still likable and have friends.
D. His miserable behaviour and rural background are more likely to be reasons for not having affinity with someone. Miserable people are often not fun to be around, and people from rural backgrounds may have different values and interests than people from urban backgrounds.
It is important to note that these are just general trends, and there are always exceptions. There are selfish people who are likable, religious people who are friends with people of different faiths, socially rejected people who are likable, and miserable people from rural backgrounds who are likable. It is also important to note that affinity is a complex emotion, and there are many factors that can contribute to it.