A 10 mm thick plate-1 is welded to another plate-2 (10 mm thk) using fillet weld of thickness 10 mm,on two sides of plate-1 as shown in figure. Plate-1 projects outside plate-2 by 85 mm. An end load of 1 KN acts on plate-1. The primary shear stress produced in the weld throat is

A

173 N/mm$$^2$$

B

2.4 N/mm$$^2$$

C

85 N/mm$$^2$$

D

None of these