The first Commercial Civilian Aircraft developed by India is :
Saras
Saras is the correct answer because it was the first commercially developed civilian aircraft in India. It's a short takeoff and landing (STOL) aircraft designed and developed by the National Aerospace Laboratories (NAL). While other options might be related to Indian aviation, they don't fit the criteria of being a commercially developed civilian aircraft.
The other options are incorrect because they represent either helicopters (Pawan Hans), military aircraft (Tejas), or are not directly related to civilian aircraft development in India (Gajraj).
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