Respuesta :
The moon must be exactly crossing Earth's orbit of the sun for the full moon phase to be visible.
What is Full moon?
This is a situation where the Sun and the Moon are aligned on opposite sides of Earth with a corresponding illumination from the Sun.
It also occurs when the moon crosses the Earth's orbit of the sun and is denoted as option A.
Read more about Full moon here https://brainly.com/question/649027
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