Fiona has proved that a function, f(x), is an arithmetic sequence. How did she prove that?
A. She showed that an explicit formula could be created.
B. She showed that a recursive formula could be created.
C. She showed that f(n) ÷ f(n - 1) was a constant ratio.
D. She showed that f(n) - f(n - 1) was a constant difference.

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