Based on the Research of Zigler and Others,what If Any

Based on the research of Zigler and others,what if any benefits does attending a preschool have for a child?

A) intellectual benefits for economically disadvantaged children and social benefits for most children
B) intellectual and social benefits for most children, regardless of socioeconomic status
C) intellectual but no social benefits for most children, regardless of socioeconomic status
D) social benefits for economically disadvantaged children and intellectual benefits for most children