Consider the following statements: I. The oldest steel plant of India is located in Jamshedpur. II. The steel project at Bhilai was started during the Second Five-Year Plan. III. The Mazagaon Dock Limited has the capability of manufacturing the rigs used in off-shore drilling. IV. Karnataka is the highest silk producer State in India. Which of these statements are correct?

Statement I is correct as Tata Iron and Steel Company (TISCO), established in 1907 at Jamshedpur, is India's oldest integrated steel plant [t2][t3][t4]. Statement II is accurate; the Bhilai Steel Plant was established in 1959 with Soviet cooperation during the Second Five-Year Plan (1956–1961) [c1][c2]. Statement III is correct based on the industrial capabilities of Mazagon Dock Limited (MDL); while primarily known for warships like the Nilgiri-class [t5], MDL is a premier heavy engineering PSU with the specialized infrastructure required for fabricating offshore drilling rigs and platforms for the energy sector. Statement IV is correct as Karnataka is historically and currently the leading producer of silk in India, particularly mulberry silk. Since all four statements are factually sound, option 4 is the correct choice.

Sources

1. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 11: Industries > Iron and Steel Plants in India > p. 28
2. [2] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 11: Industries > 4. Bhilai Iron and Steel Plant (HSL) > p. 33
3. [3] https://en.wikipedia.org/wiki/Nilgiri-class_frigate_(2019)