Explanation:

2 5 8 3 2 7 3 9 5 6 4 3 8 7 1 3 2 5 6 7 1 2 4 8 7 5 6 2 4 7 8 6 2
Clearly, total seven numbers are there which are immediately preceded by an even number and immediately followed by an odd number.
Hence, option (D) is the right answer