The correct answer is D) Red and white. According to the U.S. Coast Guard regulations, mid-channel daymarks are colored red and white. These daymarks are used to indicate the center or middle of a navigable channel, helping mariners identify the safest route to follow. The red and white colors provide a clear visual contrast that makes the mid-channel daymark easily recognizable to boaters. The other options are incorrect because green and red are the colors used for lateral daymarks, green and white are the colors for range daymarks, and black and red are the colors for regulatory daymarks, which serve different purposes than mid-channel daymarks.