Refer to the following number series and answer the question.
(Left) 9 2 3 5 7 8 6 3 2 1 5 6 7 9 4 3 6 3 5 8 2 (Right)
How many  such even numbers are there in the series each of which is immediately preceded and followed by an odd number?

Given:  (Left) 9 2 3 5 7 8 6 3 2 1 5 6 7 9 4 3 6 3 5 8 2 (Right)

There is only 5 even numbers which is immediately preceded and followed by an odd number.

so that the correct answer is (d) 5.