Answer the following question: Fact 1: Aplanet rotating causes cycles of day and night on that planet. Fact 2: The gravitational pull of the major planets alters the orbital period from revolution to revolution. Given the two facts above, what causes day and night?

Choices:
[A]. chemical messengers;
[B]. The moon;
[C]. The ocean's waves;
[D]. chemical reaction;
[E]. Revolution around the sun;
[F]. The clock on the wall;
[G]. Evaporation of water;
[H]. Basic units of the plant body.;
Answer:
[E].