The correct answer is: Option D. Topic: Conflicts of man vs. man and man vs. self in "The Sniper". Thesis: The main character in "The Sniper" by Liam O'Flaherty struggles with two conflicts: man vs. man and man vs. self.
The Topic remains unchanged in between the options; the difference resides in the thesis. In Option D, the description of the main character is delivered to the reader without directly addresing them - in contrast with Options A and C. Moreover, the topic is included within - in contrast with Option B -, which makes Option D the most complete of them all.