Four statements are given below at A, B, C and D. There may be some errors in the given statement(s). The incorrect statement is your answer.

• To drain water away from the tracks, railroad beds, like road beds, are designed in which there is usually a bed of rock and gravel resulting in fast drainage from the tracks.
• Railroad beds, like road beds, are designed in which there is usually a bed of rock and gravel that results in the fast drainage from the tracks.
• A bed of rock and gravel, called the railroad bed, is designed similar to a road bed to drain water away from the tracks.
• Railroad beds, like road beds, are designed to drain water apart from the tracks, so there is usually a bed of rock and gravel resulting in fast drainage away from the tracks.