Determining the Effects of Mothers' Employment and Childcare on the Well-Being

Determining the effects of mothers' employment and childcare on the well-being of children is a complex task for many reasons, according to your text. Which is NOT one of the reasons?

A) There are different measures of child well-being.
B) There are different types of childcare settings and they may have varying quality.
C) Mothers' temperaments vary.
D) Mother's work hours, shifts, and working conditions vary.
E) Mothers and children have varying kinds of relationships, regardless of employment or childcare, and fathers may play different roles.