The correct answer is option 1, which includes M.C. Marykom, Vijender Singh, and Sushil Kumar as the recipients of the Rajiv Gandhi Khel Ratna Award for the year 2008.
Option 2, which includes Saina Nehwal instead of Sushil Kumar, is incorrect. Saina Nehwal was not a recipient of the award in 2008.
Option 3, which includes R.S. Rathore instead of M.C. Marykom, is also incorrect. M.C. Marykom was indeed one of the awardees in 2008.
Option 4, which includes R.S. Rathore instead of Vijender Singh, is also incorrect. Vijender Singh was one of the recipients of the award in 2008.
Therefore, the correct answer is option 1.