The correct answer is: B. 3200 mm
The maximum width for 8-Wheeled Goods stock in BG is 3200 mm. This is because the standard gauge for railways in BG is 1435 mm. This means that the distance between the two rails is 1435 mm. In order for an 8-Wheeled Goods stock to fit on the railway tracks, it must be no wider than 3200 mm.
Option A is incorrect because 3050 mm is less than the standard gauge of 1435 mm. This means that an 8-Wheeled Goods stock that is 3050 mm wide would not be able to fit on the railway tracks.
Option C is incorrect because 3250 mm is greater than the maximum width of 3200 mm. This means that an 8-Wheeled Goods stock that is 3250 mm wide would not be able to fit on the railway tracks.
Option D is incorrect because 3300 mm is greater than the maximum width of 3200 mm. This means that an 8-Wheeled Goods stock that is 3300 mm wide would not be able to fit on the railway tracks.