The Moon must be full. The Moon must be waxing. It must be the beginning of the month. It must be winter in the Northern Hemisphere.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following is a necessary condition for a lunar eclipse to occur?
Possibilities:
- The Moon must be full.
- The Moon must be waxing.
- It must be the beginning of the month.
- It must be winter in the Northern Hemisphere.

The Moon must be full.