The best answer would be C. a star.

Observing the relationship between a car and a traffic light:

- A traffic light guides cars whether to move or not, and to which direction.

- A car (or at least the human behind its driving wheel) reacts to the instructions given by traffic light.

Applying to the sun, the best answer would be able to influence the motion of the sun. Among the four given answer, only C. a star would fit this criterion. The motion of the sun can be influenced by the gravity field of another star. The sun accelerates towards the direction of the other sun.
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