Final answer:
The late sign of the effects of epidural opiates is maternal sedation.
Step-by-step explanation:
The correct answer is b) Maternal sedation.
After epidural placement, the opiate medications that are commonly used can cause sedation. This sedation is a late sign of the effects of epidural opiates and can be observed in the mother. It is important for healthcare providers to monitor the level of sedation to ensure the safety and comfort of the mother.