Asher is the last person in the queue (4th). The 3 students before him (1st, 2nd, 3rd) get on the bus and leave the queue.<br><br>
After all 3 leave, only Asher remains. He moves from 4th to 1st position.<br><br>
Check: Start = Jack(1st), Jill(2nd), Mary(3rd), Asher(4th). After 1st-3rd leave, only Asher stays, now 1st.<br><br>
Final Answer: 1st