Which idea best describes the theory of evolution?

Question: Which idea best describes the theory of evolution?

The theory of evolution is a scientific explanation of how living things change over time. It is based on evidence from fossils, genetics, and other sources. The theory of evolution states that all living things share a common ancestor, and that they have adapted to different environments through natural selection. Natural selection is the process by which organisms with traits that help them survive and reproduce are more likely to pass on those traits to their offspring.