the moon and Earth the moon and the sun the moon, the sun, and Earth the moon, the sun, and Venus
I gave my students this multiple choice question: Science students investigated the cause of the different phases of the moon. The model that would best demonstrate the cause of the phases of the moon would include representations of

Only one answer is correct among these 4 choices:
- the moon and Earth
- the moon and the sun
- the moon, the sun, and Earth
- the moon, the sun, and Venus

Could you tell me which one is correct?

the moon, the sun, and Earth