A traffic light controls the movement of a car, and:

A. a solar eclipse. The solar eclipse is a phenomenon caused by the position of the Moon and the Earth that blocks a large portion of sunlight. It has a significant effect on the Sun's function, which is similar to what a traffic light does to a car.
B. a solar panel. A solar panel exploits the energy in sunlight and is a device that relied on the Sun. However, it cannot affect the Sun.
C. a star. The sun is one of the stars as a category of celestial bodies, which is a deeper difference in the relationship compared to that of a car and a traffic light.
D. a mirror. Though it can change the direction or appearance of sunlight, its influence is limited to a very small portion of the Sun's function.

Therefore, A is the best answer.
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