The correct answer is D. Never give up
Explanation:
The word "theme" in literature including short-stories refers to the underlying idea of the literary work, this idea is usually linked to some belief about life, love, death, happiness, etc. the author of the literary work wants the audience to understand. In some cases, the theme is explicitly or directly stated, but in most cases, the theme can be known by analyzing different literary elements including the actions of the plot, the conflict of the story and the actions of the character which reveal some critique belief about some aspect.
Considering this, in the case presented the story Pavel read show the main character starts a difficult mission and despite the time, effort and difficulties the character continues until it achieves success, which shows the belief the author wants to transmit to the audience or theme is the importance of being determined and persistent until achieving the purpose goal or that it is important to "never give up".