The Main Problem with the Concept of 'Single Parenting' Is

The main problem with the concept of 'single parenting' is that

A) it ignores the parenting activities of the non-custodial parent.
B) it doesn't acknowledge that it is usually mothers who are doing the parenting.
C) it doesn't reflect the additional community support available to these parents.
D) it doesn't distinguish whether parents are 'single' through divorce or through unwed pregnancy.
E) it also includes cohabiting couples who are not actually single.