What’s the main idea of this passage

A．The attitudes of different people toward others are very strangely different.
B．Some people are much interested in conversing on the same topics in the course of a long train journey.
C．The attitudes of some people are to develop a friendly feeling toward those with whom they come into contact.
D．Some people have keen interest in whatever they see and whomever they make the acquaintance of.

A．Some men find almost everybody boring.
B．Some men may ascertain the most secret histories of several of the passengers in the course of a long train journey.
C．Some may find it easy to develop a friendly feeling towards others.
D．Some may like to travel with the same idle rich.