circular with a period of about one month circular with a period of about one week elliptical with a period of about one month elliptical with a period of about one week
I gave my students this multiple choice question: Which best describes the orbit of the Moon around Earth?

Only one answer is correct among these 4 choices:
- circular with a period of about one month
- circular with a period of about one week
- elliptical with a period of about one month
- elliptical with a period of about one week

Could you tell me which one is correct?

elliptical with a period of about one month