I hope they add more multiple word answers since as it is this type of question just has 3 single character incorrect answers and 1 double character correct answer taking the difficulty away from even guessing making it mindless and not really enforcing the memorization of vocabulary.
you have to put the translation in the Chinese words and after these explanation of the chinese words the exercise, now you have to pick up the translation in the excercises, so maybe there is someone at duolingo to help people how to do that, so people will learn it more quickly. They are not educators but very helpful for us with their excellent knowledge of the chinese language, and we are very grateful for that!!
I feel like questions like this give it away by only having one option that contains two characters. If it were to pair up a few of them to give us more pairs to choose from, it would better ensure that you're learning to identify the characters. I'm not saying the question is bad, just that it should make the choices less of a giveaway
According to Chinese Wikipedia (and Google's rough translation): Eight Yuan refer to "Biefen, Zhongkan, Shu Xian, Ji Zhong, Bohu, Zhongxiong, tertiary leopard, seasonal beaver". According to historical records, they were the "witches" of the emperors. https://zh.wikipedia.org/wiki/%E5%85%AB%E5%85%83