【单选题】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 nineth century because parents began to increase their emotional investment in the upbringing of their children.
B.
The cash value of children rose during the nineth century because their expected earnings over the course of a lifetime increased greatly.
C.
The cash value of children rose during the nineth 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 nineth 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 nineth century because of changes in the way negce law assessed damages in accidental-death cases.
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