Final answer:
In utero, stable vital signs are optimal for fetal health, which is monitored throughout the stages of pregnancy.c) Be stable
Step-by-step explanation:
In utero, optimal conditions for a fetus involve vital signs that are stable. Fluctuations or significant changes can indicate stress or distress to the fetus. Fetal health is closely monitored by various means to ensure that growth, heart rate, and movements are within expected parameters during each stage of pregnancy, including the first trimester, second trimester, and third trimester.