The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.

Experts agree that health and safety requirements, developmentally appropriate activities, limited group size, adequate staff training in child development and early childhood education, warm staff-child interactions, adequate staff salaries, and adequate indoor and outdoor space are key components of quality child care. Child-care giver ratios, group sizes, and teacher qualifications are probably the most critical.
Agreement about what （） quality child care.