Werner's Longitudinal Study of the Effects of Birth Complications on the Development

Werner's longitudinal study of the effects of birth complications on the development of children living on Kauai at the 2-year follow-up found that long-term effects of severe perinatal complications were

A) minimized in families where mothers had high intelligence regardless of the socioeconomic level of the family.
B) minimized in stable, high-socioeconomic-status family environments where mothers had high intelligence.
C) present at the same levels across all families.
D) relatively absent across all children and families studied.