Identify the type of abortion where the changes progress to a state from where continuation of the pregnancy becomes impossible.

Correct option is B

Inevitable abortion refers to a stage where clinical signs indicate that the pregnancy cannot continue. The cervix is dilated, bleeding is profuse, and there is rupture of membranes or uterine contractions. At this point, despite no expulsion of products of conception yet, the process of miscarriage is irreversible.
Explanation of options: (a) Threatened abortion – In this type, there is vaginal bleeding but the cervix remains closed, and the pregnancy may still continue successfully with rest and monitoring. (b) Inevitable abortion – This is the correct answer. It is diagnosed when abortion is in progress with cervical dilation and other signs that make continuation of pregnancy impossible. (c) Complete abortion – This refers to the complete expulsion of all products of conception from the uterus. It is a concluded event, not a progressive stage. (d) Missed abortion – In missed abortion, the fetus is non-viable but retained inside the uterus without any symptoms like bleeding or pain, and the cervix is closed.