By using sieve analysis, the particle size distribution curve has been plotted for a particular soil. The coefficient of curvature Cc is given by

• A. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/82-504-1.png">
• B. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/82-504-2.png">
• C. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/82-504-3.png">
• D. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/82-504-4.png">