The depth of tension crack in a soft clay ( u = 0) is

• A. <img src="/_files/images/civil-engineering/gate-exam-questions/898-136-1.png">
• B. <img src="/_files/images/civil-engineering/gate-exam-questions/898-136-2.png">
• C. <img src="/_files/images/civil-engineering/gate-exam-questions/898-136-3.png">
• D. <img src="/_files/images/civil-engineering/gate-exam-questions/898-136-4.png">