To find the player with the highest career strike rate in T20 Internationals, we need to compare the strike rates of the given players:
A. Chris Gayle - Strike rate unknown
B. Virendra Sehwag - Strike rate unknown
C. AJ Redmond - Career strike rate of 177.19
D. Luke Wright - Strike rate unknown
Since the strike rates of Chris Gayle, Virendra Sehwag, and Luke Wright are unknown, we cannot determine if any of them have a higher strike rate than AJ Redmond.
Therefore, the correct answer is C. AJ Redmond, as given in the question.