If D is the overall thickness of the slab, the diameter of the reinforcing bars should not exceed

• A. <img src="/_files/images/civil-engineering/structural-design-specifications/04-22-78-1.png">
• B. <img src="/_files/images/civil-engineering/structural-design-specifications/04-22-78-2.png">
• C. <img src="/_files/images/civil-engineering/structural-design-specifications/04-22-78-3.png">
• D. <img src="/_files/images/civil-engineering/structural-design-specifications/04-22-78-4.png">
• E. <img src="/_files/images/civil-engineering/structural-design-specifications/04-22-78-5.png">