Final answer:
The nurse would question the order to obtain equipment for a manual pelvic examination.
Step-by-step explanation:
The nurse would question order number 3, which is to obtain equipment for a manual pelvic examination. In the case of placenta previa, a manual pelvic examination should be avoided to minimize the risk of further bleeding or complications. Instead, non-invasive methods, such as ultrasound and external electronic fetal heart monitoring, should be used to assess the condition of the fetus and determine the extent of placenta previa.