Which statement about studying the effects of nonparental care on development is accurate? The effect of nonparental care on infant development is difficult to determine, largely because there are many types of nonparental care arrangements. The effect of nonparental care on infant development is easily determined simply by comparing babies who are cared for by their grandparents to those cared for by their parents. The effect of nonparental care on infant development is easily determined simply by comparing babies in day care to those cared for by their parents. The effect of nonparental care on infant development is difficult to determine, primarily because there are no clear statistics on how many infants are enrolled in day-care programs.