If in the number sequence 8 4 156327945 2, all the odd numbers are decreased by one and all the even numbers are increased by one, then the new number sequence is arranged in descending order, which will be the ninth digit from the left?

Correct option is C

Sequence:
8 4 1 5 6 3 2 7 9 4 5 2

Odd numbers −1:
1→0, 5→4, 3→2, 7→6, 9→8, 5→4

Even numbers +1:
8→9, 4→5, 6→7, 2→3, 4→5, 2→3

New sequence:
9,5,0,4,7,2,3,6,8,5,4,3

Arrange descending:
9,8,7,6,5,5,4,4,3,3,2,0

9th digit = 3