Where would more likely be the environment of a red and gray silty mudstone with raindrop impressions, fossil roots, and mudcracks?

Where would more likely be the environment of a red and gray silty mudstone with raindrop impressions, fossil roots, and mudcracks? An (a) ocean floor, (b) muddy bay/estuary, (c) evaporating bay, (d) peat bog/swamp, or on land?

The answer will be: d) peat bog/swamp, or on land .Swamp : wetland: an area of land, usually fairly large, that isalways wet and is overgrown with various shrubs and trees