The 20 of adolescents in the United States who are only children have been found by research to ...

B

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A Incorrect. The 20 of adolescents in the United States who are only children have not been found by research to experience loneliness and a tendency to isolate themselves.
B Correct. The 20 of adolescents in the United States who are only children have been found by research to experience fairly high self-esteem and achievement motivation.
C Incorrect. The 20 of adolescents in the United States who are only children have not been found by research to experience serious jealousy of children from large families.
D Incorrect. The 20 of adolescents in the United States who are only children have not been found by research to experience high-risk behaviors in at least three areas of their lives.

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