A nurse is preparing a child for a lumbar puncture. In which of the following positions should the child be placed for the procedure?

A. The prone position is not suitable for a lumbar puncture. B. The lateral position, with knees drawn up to the chest, is the most common position for a lumbar puncture. It helps widen the spaces between the vertebrae, making it easier to insert the needle. C. Semi-Fowler's position is not appropriate for a lumbar puncture. D. The supine position is not suitable for a lumbar puncture.