The coefficient ka of the active earth pressure, is given by

• A. <img src="/_files/images/civil-engineering/soil-mechanics-and-foundation-engineering/38-11-129-1.png">
• B. <img src="/_files/images/civil-engineering/soil-mechanics-and-foundation-engineering/38-11-129-2.png">
• C. <img src="/_files/images/civil-engineering/soil-mechanics-and-foundation-engineering/38-11-129-3u.png">
• D. <img src="/_files/images/civil-engineering/soil-mechanics-and-foundation-engineering/38-11-129-4u.png">