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The most important measure of the size of a river is the

Anumber of its tributaries.
Bsize of its watershed.
Cwidth of its mouth.
Dvolume of its discharge.

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osprey2015

I'd guess b on this one. I don't know the definition of watershed, but the amazon is a pretty big expanse of water "stretching" a long way (albeit that water doesn't stretch).

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