Final answer:
The recommended position for a client after a myelography using a water-soluble contrast dye is usually to lie flat on their back, to help maintain even distribution of the contrast dye and prevent complications.
Step-by-step explanation:
After a client has undergone a myelography using a water-soluble contrast dye, it is generally recommended to position the client to facilitate the proper dispersion or absorption of the dye and to reduce the potential for headaches and other complications. The specific position can depend on the type of contrast used and the healthcare provider's preferences. A common practice is to keep the client lying flat to prevent the dye from moving towards the brain, where it can cause increased intracranial pressure and headaches.
Therefore, the correct position for the client after a myelography would be c. flat on the back. This position helps maintain even distribution of the dye within the cerebrospinal fluid and avoids complications related to its displacement.