The simplified form of
\frac{1}{\sqrt{3}+\sqrt{4}}+\frac{1}{\sqrt{4}+\sqrt{5}}+\frac{1}{\sqrt{5}+\sqrt{6}}+\frac{1}{\sqrt{6}+\sqrt{7}}+\frac{1}{\sqrt{7}+\sqrt{8}}+\frac{1}{\sqrt{8}+\sqrt{9}} is :
[A] \sqrt{3}
[B] 3-\sqrt{3}
[C] 3\sqrt{3}
[D] 5-\sqrt{3}

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