DIRECTION for the question: Solve the following question and mark the best possible option.

Count each 1 in the following sequence of numbers that is immediately followed by 2, if 2 is not immediately followed by 3.
How many such 1s are there ?

1 2 1 3 4 5 1 2 3 5 2 1 2 6 1 4 5 1 1 2 4 1 2 3 2 1 7 5 2 1 2 5

A

5

B

4

C

2

D

7

E

9