If At is the area of steel cross-section, t is working stress, L is width of road and W is weight of slab per square metre, the spacing of the tie bars for a longitudinal joint, is

• A. <img src="/_files/images/civil-engineering/highway-engineering/39-16-196-1.png">
• B. <img src="/_files/images/civil-engineering/highway-engineering/39-16-196-2.png">
• C. <img src="/_files/images/civil-engineering/highway-engineering/39-16-196-3.png">
• D. <img src="/_files/images/civil-engineering/highway-engineering/39-16-196-4.png">