The option that best simplifies the process of exposure for photographers capturing images in the dark is the removable flash. A removable flash provides additional lighting, making it easier to take well-exposed photos in low-light conditions.
While a remote shutter trigger can help prevent camera shake during long exposures, it doesn't directly enhance the photographer's ability to capture images in the dark like a flash would. An LCD screen can provide information about exposure settings, but it does not assist with exposure itself. An SD card is simply for storage and doesn't impact the exposure process.