Explanation

Eoin Morgan is correct because he holds the record for hitting the most sixes in a single day's international match. A.b devilliers is incorrect because he did not hit the record number of sixes on one day. Shahid Afridi is incorrect because while he hit many sixes, it was not the highest recorded total for one day. Chris Gayle is incorrect because although he has hit many sixes, his total in a single day does not beat Morgan's record.