Final answer:
Hyperventilation in the woman results in further fetal acidosis.
Step-by-step explanation:
The correct answer is a) Hyperventilation.
Hyperventilation is an increased ventilation rate that leads to abnormally low blood carbon dioxide levels and high (alkaline) blood pH. In the context of the question, further fetal acidosis can be caused by hyperventilation in the woman, as it reduces the level of carbon dioxide in the blood, leading to increased pH levels.