D ① It is said that the Plum Garden "decorates the mountains with plums, and the mountains with plums" refers to its architectural style, so it should be "unique". ② It is said that Su Shi (person) and the other four people are collectively called the Four Great Masters, and the subject of "unique" should also be people. ③There is the word "novel idea" in the sentence, and its meaning corresponds to "not falling into the mold". ④The word "Xianbi" in the sentence is exactly opposite in meaning to the word "Ingenuity and unique luck", so the word "Ingenuity and unique luck" is chosen.