Jane is 4th from the front, so 3 people are ahead of her.<br>
Jane is 2nd from the back, so 1 person is behind her.<br><br>
&bull; Total people = 3 (ahead) + Jane + 1 (behind) = 5.<br>
&bull; Bob is behind Jane, so Bob is the last person in the queue.<br>
&bull; The last person in a queue of 5 is the 5th.<br><br>
Final Answer: A: 5th