Which of these famous Oklahomans are best known as country singers and musicians?

Carrie Underwood and Toby Keith are both famous Oklahoma-born country singers and musicians. Ralph Ellison and Angie Debo were writers and historians, Spencer Asah and Jack Hokeah were artists, and Jim Thorpe and Troy Aikman were athletes. Therefore, the correct choice is C, Carrie Underwood and Toby Keith.

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