which of the following is NOT an important driver of the growing "participation gap" between people from low-SES and people from high-SES families? increasing cost of participating in sports and other activities increasing gap in income between high-SES and low-SES families increasing adoption of tougher rules related to minimum grades required for participation in sports and other activities increasing tendency for high-SES families to be concentrated in high-resource neighborhoods, separate from neighborhoods occupied by low-SES families