The maximum magnitude of shear stress due to shear force F on a rectangular section of area A at the neutral axis, is

• A. <img src="/_files/images/civil-engineering/theory-of-structures/87-21-74-1.png">
• B. <img src="/_files/images/civil-engineering/theory-of-structures/87-21-74-2.png">
• C. <img src="/_files/images/civil-engineering/theory-of-structures/87-21-74-3.png">
• D. <img src="/_files/images/civil-engineering/theory-of-structures/87-21-74-4.png">