Explanation

Hannan Sarwar is the correct answer as he is known to be a young Pakistani-origin teen who became a Councilor in the UK. Hamid Zulfiqar is incorrect because there is no information confirming him as the youngest such person. Zahid Ashraf is incorrect because there is no information confirming him as the youngest such person. Zafar Khalil is incorrect because there is no information confirming him as the youngest such person.