Explanation

B is correct because Babar Azam was the captain of Pakistan in T20 matches during 2019. A is incorrect because Azhar Ali was not the primary T20 captain that year. C is incorrect because Sarfraz Ahmed's role or captaincy status for all T20 matches in 2019 is questionable compared to Babar Azam. D is incorrect because a specific player listed was indeed the captain.