A farmer wishes to use 36.2 mm x 175 mm Spruce #2 graded lumber from his tree lot as floor joists. According to Division. B, Part 9., the maximum permitted span of the floor joists with bridging and strapping and spaced at 406 mm, is 

(a) 3.40 m 

(b) 3.72 m 

(c) 3.58 m 

(d) 3.53 m