Which one of the following is most stable ?
 

• Hyperconjugation is the movement of electrons to the sigma bond. 
• 2,3-Dimethyl-2-butene is more stable as it can form the highest number of hyperconjugative structures which is 6 as it has 6$\propto$hydrogen atoms. 

After following the steps you can get those stability order 

Hence the correct answer is C) 2,3-Dimethyl-2-butene