In the formula a + bk for the calculation of the net effective section of single angles in tension connected by one leg only, the value of k, is

• A. <img src="/_files/images/civil-engineering/structural-design-specifications/08-22-122-1.png">
• B. <img src="/_files/images/civil-engineering/structural-design-specifications/08-22-122-2.png">
• C. <img src="/_files/images/civil-engineering/structural-design-specifications/08-22-122-3.png">
• D. <img src="/_files/images/civil-engineering/structural-design-specifications/08-22-122-4.png">