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:

Current scientific understanding is that the solar - system began to form about 4.6 billion years ago, which is closest to the option of about 5 billion years ago.

Answer:

About 5 billion years ago