You will be given a definition of a task first, then some input of the task.
In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Question: What instrument did George Russell play? Passage:There is a great deal written in music history books about the period of artistic experimentalism after World War II in Europe and the United States. Much like the period in France after the Franco-Prussian War (Impressionism) and in the late 19th century, the pre/post World War I period of (Expressionism), the post World War I period of Modernism was no different with composers trying to 'write music for the sake of music' and not attaching it to a social meaning or meant for a social cause (see Darmstadt School). The LP City of Glass and the whole body of work from the Stan Kenton orchestra and Robert Graettinger (19471953) is a direct product of the experimental American music scene of the post World War II era. Though overshadowed historically by other compositional endeavours in jazz at the time attributed to George Russell, Neal Hefti or Lennie Tristano, Graettinger and City of Glass is important in the progress that was to be part of Third stream jazz.
Links: a. Europe b. Expressionism c. Expressionism d. George Russell (composer)
Output:
d