A confluence is... a. The point where the river meets the sea/lake

b. The original point from which the river flows

c. The point where two rivers meet

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C. The point where two rivers meet

Explanation:

The noun Confluence means "the junction of two rivers, especially rivers of approximately equal width."

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1."lessen the worth of ."

2."increase the worth of."

3." beyond the worth of."

4."against the worth of ."