Observe the following figures and their corresponding formulas, and calculate 1 + 8 + 16 + 24 + according to the rule you found +The result of 8N (n is a positive integer) is () A. （2n+1）2B. （2n-1）2C. （n+2）2D. n2

Graph (1): 1 + 8 = 9 = (2 × 1 + 1) 2; graph (2): 1 + 8 + 16 = 25 = (2 × 2 + 1) 2; graph (3): 1 + 8 + 16 + 24 = 49 = (3 × 2 + 1) 2 Then graph (n): 1 + 8 + 16 + 24 + +8N = (2n + 1) 2

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