Thanks for posting,
ttunden!
First, I love that you are seeking to mine the passage for the information to support your answer choice. And you know exactly where we need to look: paragraph 3!
And you are completely right that the Konate sculptors used a carving style on the Nuna and Ko masks that was previously used by a different tribe. I even think "adoption" is fine here, as that simply means that the Konate sculptors took on the style - and they did! But you're ignoring a super important key word here that changes everything: the word "only".
(D) is saying that that style was previously used ONLY by members of another tribe. Can we really support that those foliate patterns and diamond-shaped mouths were used ONLY by the Nuna and Ko, respectively? We have no idea!! There's zero information about whether any
other tribe also used those styles before the Konate adopted them.
One significant, powerful word can make all the difference, if it is a word that we can't legitimately support. This is often case with wrong answers in Reading Comprehension!
In contrast, the correct answer
(C) has no such unsupportable language. The Konate did indeed produce sculptures in several distinct styles (Nuna, Ko, and others), that are "very similar" ("so subtly different that few people outside of the area can distinguish Nuna masks from Ko masks").
Each remaining
incorrect answer contains some specific element that we cannot support:
(A) Nothing is mentioned about the Konate using "nontraditional materials"!
(C) No "stylistic innovations" are mentioned, nor do we have any support that the Konate sculpture has "influenced the work of other sculptors".
(E) We have no evidence that the Konate "introduc[ed]" this practice!
Small words like "only" can be easy to read over, but they pack a giant punch! Build up your language sensitivity, or radar, so that you more likely to spot these words from the start!
Please let me know if that completely answers your question!