Question

about how long ago did our solar system start to form?
about 5 million years ago
about 14 million years ago
about 5 billion years ago
about 14 billion years ago

Explanation:

Astronomical evidence (like radiometric dating of meteorites, the oldest solar system materials) confirms the solar system began forming around 4.6 billion years ago, which is closest to 5 billion years. The 14 billion year mark refers to the age of the universe, not the solar system.

Answer:

About 5 billion years ago