The best of Sigur Ros's music evokes___________ landscape, as if the music had transported one to some twilight avenue in a long since abandoned city.

While solving a TC/SE we can try to reuse the words in the sentence. Here, we can reuse the word twilight because, the author says the music of SR evokes twilight in to a long abandoned city.

□ a dusky- dim; gloomy
□ an urban- in, relating to, or characteristic of a town or city.
□ a crepuscular- Twilight; Dusky
□ a precipitous- done suddenly and without careful consideration
□ an avuncular- kind and friendly towards a younger or less experienced person
□ a civic- relating to a city or town, especially its administration; municipal

Dusky and crepuscular are the correct words

PS.: Even if you don't know the meaning of the word crepuscular, eliminating the other choices from the options will leave us with A & C. All the other are banal words.

IMO A & C

Hope this helps!