On average, children of cohabiting parents have slightly worse wellbeing than children of married parents. which of the following has not been given as an explanation for that finding?
a. cohabiting parents are more economically disadvantaged than married parents
b. cohabiting parents are more likely to engage in permissive styles of parenting than married parents
c. cohabiting parents are more likely to separate than married parents are to divorce
d. cohabiting parents may make lower investments in their children than married parents