已知等差数列{an}的前n项和为Sn，若OB→=a1OA→+a100OC→，且A、B、C三点共线（该直线不过原点O），则S100=

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已知等差数列{a_n}的前n项和为S_n，若OB→=a₁OA→+a₁₀₀OC→，且A、B、C三点共线（该直线不过原点O），则S₁₀₀=（　　）

A：50

B：51

C：100

D：101

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A

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