Which of the following could indicate a high fetal heart rate (FHR)?

A high fetal heart rate (FHR), or tachycardia, can be associated with several maternal or fetal conditions that lead to increased stress on the fetus or altered physiological states. Infection can lead to maternal fever and result in an increased heart rate in the fetus as a compensatory mechanism to maintain adequate oxygenation. Low oxygen levels, or hypoxia, in the fetus can also trigger an increased heart rate as a response to ensure that vital organs receive sufficient blood flow and oxygen.

Young maternal age can influence FHR, although it's more complex than direct causation. Younger mothers may experience different physiological responses, and in some cases, their lower body mass index and different hormonal levels could contribute to variations in fetal heart rate patterns.

While there are other options that could also relate to high fetal heart rate indirectly, this particular combination includes well-documented factors that have a clear and established link to an increase in FHR through mechanisms associated with maternal health and the fetus's response to stressors or physiological changes.