In Which Situation Would It Be Appropriate to Obtain a Fetal

In which situation would it be appropriate to obtain a fetal scalp blood sample to establish fetal well-being?

A) The fetus has developed tachycardia related to maternal fever.
B) The mother has vaginal bleeding, and the baseline fetal heart rate is decreasing.
C) The fetal heart tracing on a preterm fetus shows decreased baseline variability.
D) The fetal heart tracing shows a persistent pattern of late decelerations, with normal baseline variability.