A bar of elastic material is subjected to a direct compressive stress 1 in the longitudinal direction. Suitable lateral compressive stress 2 is applied along each of the other two lateral directions to limit the net strain in each of the lateral directions to half the magnitude of what it could be under 1 acting alone. If is the Poisson's ratio of the material, then the magnitude of 2 is

• A. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/98-592-1.png">
• B. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/98-592-2.png">
• C. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/98-592-3.png">
• D. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/98-592-4.png">