How many 6’* are there in the following sequence, which are either immediately preceded by 2 or immediately followed by 9?
5 6 2 4 3 6 9 2 6 7 1 6 4 7 6 8 2 6 3 4 6 9 8 6 2
(A) 1
(B) 2
(C) 3
(D) 4
correct answer is (D) 4
