Find a Formula for the Nth Term of the Arithmetic $a _ { n } = n + 1$

Multiple Choice

Find a formula for the nth term of the arithmetic sequence shown in the graph.
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A) $a _ { n } = n + 1$
B) $a _ { n } = n - 3$
C) $a _ { n } = n + 2$
D) $a _ { n } = 3 - n$