The sequence you've provided is:
9, 8, 7, 6, 5, 4, 3, 2, 1
To find the seventh number, we can simply count the numbers in the sequence:
1st: 9
2nd: 8
3rd: 7
4th: 6
5th: 5
6th: 4
7th: 3
8th: 2
9th: 1
The seventh number in the sequence is 3.
None of the options (A. 6, B. 4, C. 7, D. 4) provided match the seventh number in the sequence.