Which of the following led to more children entering high school?
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a. new laws requiring factories to pay children a fair wage
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b. new laws restricting how long working mothers could work
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c. new laws restricting how long fathers could be away from home
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d. new laws requiring younger children to go to school

D. New laws requiring younger children to go to school

Explanation:

Factories never had to pay children a fair wage because before the labor movements children were removed from the workforce entirely.

Both B and C have nothing to do with children so that can not be the answer

The only one that is left is D and that is the correct answer. New laws came into power during the first half of the 20th century and many highschools were built at that time.