Someone please help me, I’m on a time limit :( Lucia and Junior observe the Moon every night for a month. They notice that the Moon changes shapes each night. Which of the following best explains
why Lucia and Junior see various Moon shapes throughout the month?

1: The Sun illuminates the Moon's surface as the Moon revolves around Earth.

2: The shadow of Earth falls on the Moon, causing varying shapes of the Moon.

3: Earth's atmosphere gives off varying amounts of light energy throughout the month.

4: The rotation of Earth around the Moon means we see it from different angles.