​Scenario: Sarah takes care of her son instead of sending him to a day care that charges​ $12,000 annually. Which of the following will happen if she puts him into a day​ care? A. The​ country's GDP will remain unchanged. B. The​ country's GDP will increase by​ $12,000. C. The​ country's GDP will decrease by​ $12,000. D. The​ country's trade deficit will increase by​ $12,000.