The correct option is
B Reformers' belief that child labor and industrial homework should be abolished.
To find what this appearance of view refers to, it is necessary to look back to the beginning of the sentence. This view, not shared by working-class mothers, refers to the reformers' conviction that child labor and industrial home work were equally inhumane practices that should be outlawed.
A This view must refer back to a point already stated; resistance to child labor laws is not discussed until the following sentence.
B Correct. This view refers to the position of reformers stated earlier in the same sentence: that child labor and industrial home work .. .should be outlawed.
C This view must refer back to a point already stated; the reformers' belief that resistance to child labor laws was due to poor parenting is discussed later in the passage.
D A number of women historians have said that working-class mothers did not always share the view of middle-class women reformers about child labor.
E This view must refer back to a point already stated; the fears of working-class families are examined in the following sentence.
The correct answer is B.