参考答案

正确答案：D
解析：根据第一段“The formation，maintenance， and dissolution of the family are in large part a function of the relative balance between the benefits and costs of marriage as seen by the individual members of the marriage”得知，作者认为婚姻家庭的稳定与婚姻的获益和成本间的平衡有关。而最后一段末句指出公共福利的资助既降低了婚姻的获益，也减少了其解体的成本，因而导致了由于福利引起的婚姻的不稳定。故选D。A项不明确，只是说“agreement”，而文中指出的是“agreement on family consumption and production”；B与文章观点相反；C项过于绝对。