The correct answer is A) when the craft clears the water. This is the correct answer because when retrieving the survival craft, the engine should be stopped once the craft has cleared the water. This allows for a safe and controlled recovery of the survival craft without the engine running, which could pose a safety hazard to the personnel involved in the retrieval process. The other options are incorrect because: B) when the cable has been attached is too early in the process, C) on approach to the platform is also too early, and D) at the embarkation is not the appropriate time to stop the engine during the retrieval of the survival craft.