An arithmetic sequence is given. Find the common difference and write out the first four terms.{sn} = {2n + 9}
A. d = 9; s1 = 11, s2 = 13, s3 = 15, s4 = 17
B. d = 2; s1 = 2, s2 = 11, s3 = 13, s4 = 15
C. d = 2; s1 = 11, s2 = 13, s3 = 15, s4 = 17
D. d = 9; s1 = 2, s2 = 11, s3 = 13, s4 = 15
Answer: C
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