Given data: It is given to identify that which of the following is a more stable carbocation.

Explanation: Tertiary carbocation is that the most stable carbocation because of the electron releasing effect of three methyl groups.

${\left(C{H}_3\right)}_3 C^{+}$ has (3⁰ ) carbocation.
The order of stability of carbocation is 3^o>2^o>1^o 
 

   is the stable carbocation.

Hence, option C is correct.