Explanation

Naseem Shah is the correct answer because he holds the record for the youngest fast bowler to take a five-wicket haul in Test cricket. Shaheen Shah Afridi is incorrect because while he is a fast bowler, he did not achieve this specific milestone younger than Naseem Shah. Shahid Afridi is incorrect because he was not known primarily as a fast bowler achieving this record. Mohammad Aamir is incorrect because he has not achieved the distinction of being the youngest to take a Test five-for.