39. Which of the following alternative explanations of the change in the cash value of children would be most likely to be put forward by sociological economists as they are described in the passage?
(A) The cash value of children rose during the nineteenth century because parents began to increase their emotional investment in the upbringing of their children.
(B) The cash value of children rose during the nineteenth century because their expected earnings over the course of a lifetime increased greatly.
(C) The cash value of children rose during the nineteenth century because the spread of humanitarian ideals resulted in a wholesale reappraisal of the worth of an individual
(D) The cash value of children rose during the nineteenth century because compulsory education laws reduced the supply, and thus raised the costs, of available child labor.
(E) The cash value of children rose during the nineteenth century because of changes in the way negligence law assessed damages in accidental-death cases.
根据答案此题的最佳定位词是上面红色标记的部分，但是我做题时把它定位到了蓝色部分的词上了，请问大家当遇到两个可定位的地方时，应该根据什么原则，怎么才能找好定位词呢？谢谢！ | 
