Each child has his individual pattern of social, as well as physical, development. Some of it depends on his home life and his relationships with the people who love him. Children in large families learn how to get along with others through normal brother- sister play and tussles  . An only child, on the other hand , may have to learn his lessons in social living through hard experiences on the playground or in the classroom. Twins who always have one another to lean on may be slow in responding to others because they do not need anyone else. A child who is constantly scolded and made to feel he does everything wrong may have a difficult time developing socially. He may be so afraid of displeasing the adults around him that he keeps to himself (where he can't get into trouble)or he may take the opposite route and go out of his way to create trouble. Like the deserted child, he too may return to infantile  pleasures, developing habits that will satisfy him, but create barriers toward social contact. The passage implies that which of the following may have the earliest time learning to get along with others?
An only child A child from a large family Twins Children who are continually scolded