Three places, one birthday
The test asks: what 3 places formed about 4.6 billion years ago? Answer: Earth, the Sun, and the Moon — or Earth, the Sun, and the solar system. They formed together from a collapsing cloud of gas and dust.
Do not mix the zeros
Billion, not million. 4.6 billion years is 4,600,000,000. That number is one of the easiest points on the test if you lock it in.