Correct option is D
Given: Sequence: 7 6 7 8 6 7 5 6 8 7 7 8 6 5 4 5 6 3 4
Explanation: Ascending consecutive pairs (n, n+1) are:
· (6, 7)
· (7, 8)
· (6, 7)
· (5, 6)
· (7, 8)
· (4, 5)
· (5, 6)
· (3, 4)
Total pairs = 8
The correct answer is (d).