向量overrightarrow(a)、overrightarrow(b)、overrightarrow(c)两两垂直,且|overrightarrow(a)|=1,|overrightarrow(b)|=2,|overrightarrow(c)|=3,则|overrightarrow(a)+overrightarrow(b)+overrightarrow(c)|=( )

A. $\sqrt{10}$

B. -$\sqrt{14}$

C. -$\sqrt{10}$

D. $\sqrt{14}$

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