Correct option is A
To arrange the words in dictionary order, we compare them letter by letter:
1. C. Epigene (comes first because "i" comes before "l", "s", "t", and "o" in the next words)
2. E. Epilogue (next because "l" comes before "s", "t", and "o")
3. B. Episode ("s" comes before "t" and "o")
4. A. Epitaxy ("t" comes before "o")
5. D. Epitome (last, as "o" comes after "t")
Thus, the correct order is: Epigene, Epilogue, Episode, Epitaxy, Epitome.