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Answer:
D. Always travels in a straight line.
Explanation:
What Happened: When the cards were lined up so that you could see the light, the holes were in a straight line, and the stirrer or broom straw fit easily through all three holes. When light moves away from an object, it moves in a straight line unless something acts on it to bend it.
Light rays travel in straight lines, away from the light source. These next two experiments show how distance from a light source affects the appearance of those rays.