Who among the following was the first army officer of Independent India to be conferred the rank of Field Marshal?

Sam Manekshaw

The correct answer is Option 1- Sam Manekshaw

Sam Manekshaw was the first army officer of Independent India to be conferred the rank of Field Marshal. He was awarded the rank in 1973 for his leadership of the Indian Army during the 1971 Indo-Pakistani War, which resulted in the liberation of Bangladesh.

The other options you provided are also distinguished Indian Army officers, but none of them held the rank of Field Marshal. Tapishwar Narain Raina and Gopal Gurunath Bewoor were both Chiefs of the Army Staff, but they were promoted to the rank of General, not Field Marshal. Om Prakash Malhotra was a Lieutenant General who was awarded the Padma Bhushan for his service.