【正确答案】 A

【答案解析】Fetal heart sounds in the upper right quadrant and meconium-stained amniotic fluid indicate a breech presentation. The staining is usually caused by the squeezing actions of the uterus on a fetus in the breech position, although late decelerations, entrance into the second stage of labor, and multiple gestation may contribute to meconium-stained amniotic fluid.