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Option 1 - I, II and III: This option is incorrect. While statement I is correct (the oldest steel plant of India is located in Jamshedpur), statement II is not correct. The steel project at Bhilai was actually started during the First Five-Year Plan. Statement III is correct (Mazagaon Dock Limited has the capability of manufacturing the rigs used in off-shore drilling).
Option 2 - I and II: This option is incorrect. While statement I is correct, statement II is not correct. The steel project at Bhilai was started during the First Five-Year Plan.
Option 3 - III and IV: This option is also incorrect. While statement III is correct, statement IV is not correct. Karnataka is not the highest silk producer state in India.
Option 4 - I, II, III and IV: This option is correct. Statement I, II, III, and IV are all correct. The oldest steel plant of India is located in Jamshedpur, the steel project at Bhilai was started during the First Five-Year Plan, Mazagaon Dock Limited has the capability of manufacturing the rigs used in off-shore drilling, and Karnataka is the highest silk producer state in India.