Although Samantha (was) the (least experienced) violinist in the competition, her final performance was more (brilliantly) executed (than any) of her competitors. Answer:D
is “any” usually wrong when used in comparisons?

The error here is that Samantha’s performance is being compared to people. There’s nothing inherently wrong with the word “any.” The error is that “than any” is where “than those of any” should be.