Cervix is shortened and thinned. This indicates cervical effacement, which is the thinning and softening of the cervix in preparation for childbirth. Cervical effacement is measured in percentages, from 0% (no effacement) to 100% (fully effaced).

Choice A is wrong because cervix is soft and pliable does not necessarily mean it is effaced. The cervix can soften before it thins and shortens.

Choice C is wrong because cervix is dilated and open indicates cervical dilation, which is the opening of the cervix. Cervical dilation is measured in centimeters, from 0 cm (closed) to 10 cm (fully dilated).

Cervical dilation and effacement are related, but not the same.

Choice D is wrong because cervix is posterior and high indicates the position of the cervix in relation to the vagina. The cervix can move from posterior (back) to anterior (front) and from high to low as labor progresses.

The position of the cervix does not indicate effacement.