A train starts from rest on a curved track of radius 800 m. Its speed increases uniformly and after 3 minutes it is 72 km/hr. Its normal acceleration after 2 minutes is

• A. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/08-33-1.png">
• B. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/08-33-2.png">
• C. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/08-33-3.png">
• D. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/08-33-4.png">