When does hypoxia occur in relation to pregnancy?

Hypoxia, which refers to a deficiency in the amount of oxygen reaching the tissues, can occur during pregnancy for various reasons. Among the provided choices, the occurrence of seizures during pregnancy is closely linked with conditions that can lead to hypoxia. For example, eclampsia is a severe complication of pregnancy characterized by seizures and can result in decreased oxygen supply due to maternal blood pressure changes and cerebral edema.

In this context, while other options might imply potential scenarios when hypoxia could occur, they don't specifically highlight a direct correlation as strongly as seizures do. Seizures can disrupt the oxygen supply and pose risks not only to the mother but also to the developing fetus, underscoring the direct link between seizures and the onset of hypoxia during pregnancy.