In the last sentence of the passage "its private partner" refers to ______.

A．it was impossible to predict which friendships would develop
B．in the long run, people get on better with those who are like them
C．students split up as soon as they discovered differences in attitudes
D．students immediately recognized others with similar attitudes and interests

A．every student has five to six friends
B．judges are always influenced by a pretty face
C．ugly people find it harder to make friends than beautiful people
D．we tend to grow fond of people if we dislike them at first sight