Final answer:
The nurse should explain that although the knee-chest position may not be comfortable, it is necessary for the safety and ease of performing the lumbar puncture.
Step-by-step explanation:
The best response by the nurse would be b) "Although the required position may not be comfortable, it will make the procedure safer and easier to perform."
The knee-chest position is the optimal position for a lumbar puncture because it helps to open up the spaces between the vertebrae, allowing for easier access to the spinal canal. Lying on the left side may not provide the same level of accessibility and could make the procedure more difficult for the medical professional.
It is important to prioritize the safety and effectiveness of the procedure rather than personal comfort during medical procedures.