The correct answer is (D) 210.
Teachers in school (10) + Workers in big factories (140) + Employees at a hospital (60) = 210 people work in the organised sector.
The organised sector includes jobs with formal registration, fixed hours, and legal protections — like schools, registered factories, and hospitals. Farmers working in their own fields and handloom weavers working at home belong to the unorganised sector, so they are excluded. Always identify which workplaces are formally registered/governed by labour laws to answer such questions.