The moon rotates round Earth, we see it as crescent moon.Hence, I agree with the initial student.
Generally, due to the fact he rightly stated that the positions of the Earth, Sun and moon continues on altering consistently due to the motion of moon round Earth.
Now, when the moon comes in between the Sun and the Earth about 1/2 component of the moon receives sunlight.
Similarly, as the moon rotates round Earth, a Earth will see the Sun-rays on the Moon coming from distinct angles and when solely a small element of the moon is illuminated via sunlight, we see it as crescent moon.
Therefore,I agree with the initial student
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