Given the task definition and input, reply with output. 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: How many episodes of Star Trek did the character Chakotay appear in? Passage:Chakotay is a fictional character who appears in each of the seven seasons of the American science fiction television series . Portrayed by Robert Beltran, he is First Officer aboard the Starfleet starship USS Voyager. The character was suggested at an early stage of the development of the series. He is the first Native American main character in the Star Trek franchise. This was a deliberate move by the producers of the series, who sought to provide an inspiration as with Uhura in for African Americans. To develop the character, the producers sought the assistance of Jamake Highwater. Despite first being named as a Sioux, and later a Hopi, Chakotay was given no tribal affiliation at the start of the series, something that was later resolved in the episode "".
Links: a. Indigenous peoples of the Americas b. Indigenous peoples of the Americas c. Star Trek d. Executive officer
c