In Bubble sort, when the first pass(iteration) is completed largest element goes to the last position.
$10,20,6,5,30,8$
Compare each element one by one,and if first_element > second_element, then swap the elements.Otherwise no swapping.
$10,20,6,5,30,8$
$10,6,20,5,30,8$
$10,6,5,20,30,8$
$10,6,5,20,30,8$
$10,6,5,20,8,30$
Option $(A)$ is the correct answer.