The best answer it's clearly (D.), it offers logic and congruence with the caption's line of reasoning, which is to set expectations and possible outcomes without specifying, since those are random pictures, which is good in the sense of point out the importance of clearly communicating a goal and inducing people to have an open mind towards the future event, avoiding possible remorse caused by unrealistic expectations by someone.
You didn't provide the excerpt but if it's the one I found online, I think A would make the most sense as the passage is primairly based around his own actions. If not A, then D would be second choice I think.
