Which type of abortion is indicated by a closed cervical os with all products of conception expelled?

The scenario described involves a closed cervical os and the complete expulsion of all products of conception, which aligns perfectly with the definition of a complete abortion. In this case, a complete abortion indicates that the pregnancy has been resolved, and there is no longer any fetal or placental tissue remaining in the uterus. The closed cervical os indicates that there is no ongoing process of miscarriage, and everything has been expelled from the uterine cavity.

In the context of other types of abortion, a threatened abortion would characterize a situation where there is vaginal bleeding and/or cramping, but the cervical os remains closed and not all products of conception have been expelled. An incomplete abortion occurs when part of the products of conception are expelled while some remain in the uterus, often with an open cervical os. An inevitable abortion typically features cervical dilation and may lack complete expulsion of the products of conception, indicating that termination of the pregnancy is unavoidable.

Thus, the description provided clearly fits with a complete abortion, making it the most appropriate answer in this context.