Why is D correct?

@Shiyi-Zhang, Happy to help. For this question, we're looking for support from the passage that will allow us to infer one of the answer choices as a principle that accurately characterizes the relationship between an artist's work and the impact it is likely to have on society. In the passage, we're given information about Watteau's influence in the first paragraph in line 4: "Watteau provided his age with an influential image of itself." In line 6, the author says that Watteau's influence "was largely due to the enterprise of Watteau's friends who, soon after his death, organized the printing of engraved reproductions of the great bulk of his work...so that Watteau's total artistic output became and continued to be more accessible than that of any other artist until the twentieth century." From this, we can infer that Watteau's friends and their promotion of his work contribute immensely to its impact on society because they helped make it really visible. This is precisely what (D) picks up on, as it says, "The degree of influence an artist's vision will have on a society is conditional on the visibility of the artist's work." (D) is a principle we can draw out from the passage, as Watteau's work and its influence on society was largely the result of his friends promoting his work and making it visible to the masses. Does this make sense? Let us know if you have any more questions!

Thanks so much for this! I think I was just moving too fast, because that answer is the perfect synthesis of the information you highlighted.