Some Studies Have Found That Children Living in Single-Parent Homes

Some studies have found that children living in single-parent homes face a higher risk of low academic achievement and of dropping out.When monetary and non-monetary resources are statistically controlled,what happens to this relationship?

A) it is reduced and may even disappear
B) it is increased
C) it gives further evidence that the relationship is strong
D) it proves that children in single-parent homes face many academic challenges