Find all specified roots.Ninth roots of 1.

A. -1, cis , cis , cis , cis , cis , cis , cis , cis 
B. 1, cis , cis , cis , cis , cis , cis , cis , cis 
C. -1, cis , cis , cis , cis , cis , cis , cis , cis 
D. 1, cis , cis , cis , cis , cis , cis , cis , cis 

Answer: B

Mathematics

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