Professor: Each government should do all that it can to improve the well-being of all the children in the society it governs. Ttherefore, governments should help finance high-quality day care since such day care will become available to families of all income levels if and only if it is subsidized. Which one of the following is an assumption on which the professor's argument depends? ['Only governments that subsidize high-quality day care take an interest in the well-being of all the children in the societies they govern.', 'Government is a more efficient provider of certain services than is private enterprise.', 'Government subsidy of high-quality day care would not be so expensive that it would cause a government to eliminate benefits for adults.', 'At least some children would benefit from high-quality day care.']