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This answer choice is an example of an appositive
A. The Oregon Trail settlers traveled over 2,000 miles.
B. Thinking about the future, Lewis and Clark set off to discover the Northwest Passage.
C. Marcus Whitman, a doctor and missionary, was killed by the Cayuse Indians.
D. Memoirs allow people to tell their stories and reflect on lessons they have learned.
What is C. Marcus Whitman, a doctor and missionary, was killed by the Cayuse Indians?