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According to Telford

[A].	the size of stone at the centre varied from 160 mm to 200 mm and gradually decreased to 75 mm to 125 mm towards the haunches	[B].	the central 6 metre width of the road was covered with two layers of stones about 100 mm and 50 mm respectively
[C].	the size of stone used was of 63 mm diameter	[D].	all of the above

Answer: Option D