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."

the correct answer is blue and green.

a visible spectrum is electromagnetic spectrum color that can be seen by a normal human being by a single wavelength of light. the visible light spectrum is the range of wavelengths that make up visible light. the visible light spectrum passes through a prism enabling the rainbow reveals all the colors in the spectrum. these range from red, orange, yellow, green, blue and violet.