Critical hydraulic gradient ic is given by (where, G = specific gravity of solids e = void ratio)

• A. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/82-506-1.png">
• B. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/82-506-2.png">
• C. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/82-506-3.png">
• D. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/82-506-4.png">