Which Statement About Kelemen's Study Exploring Theory-Theory with Mexican-American Mothers

Which statement about Kelemen's study exploring theory-theory with Mexican-American mothers and their children is true?

A) Older children usually ask more questions than younger children do.
B) Mothers with more years of education recorded fewer questions asked by their children.
C) Mothers and children of lower SES asked the most questions overall.
D) Children are more likely to ask about human behavior than non-living things.