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Interference is a condition that occurs when _____.

Aone side of a wave moves at a different speed than the other

Ba wave encounters an obstruction

Ctwo or more waves overlap and combine

Dthe source of the wave’s vibration loses energy

Verified Answer :

MissPhiladelphia

For the answer to the question above, To set up a stable and clear interference pattern, two conditions must be met: The sources of the waves must be coherent, which means they emit identical waves with a constant phase difference. So I think the answer is c.two or more waves overlap and combine.
Because waves needs to be monochromatic or in single wavelength