Which of the Following Statements Best Describes a Major Conclusion

Which of the following statements best describes a major conclusion of the research study conducted by Hart and Risley (1995) ?

A) Parents have little impact on he vocabulary development of their child.
B) African-American children have a poorer vocabulary than white children.
C) Children from higher socioeconomic groups had a larger vocabulary.
D) There is no relation between social class and language interaction.