As many persons completed between D and B is same as between H and ___.

We have, D completed the training three years after F. Only three persons completed the training between C and F. C doesn’t complete on an odd numbered year. From the above condition, there are three possibilities Again we have, The number of persons completed before D is one more than the number of persons completed after B. Only one person completed the training between B and A. Again we have, The difference between the years in which G and E completed is three years. Both H and E completed the training in consecutive years. So Case2 and 3 get eliminated, hence the final arrangement becomes