Which of the following statements is true about scientific theories?

A scientific theory is indeed a well-substantiated explanation of some aspect of the natural world. This definition highlights that scientific theories are not merely speculative ideas or guesses; rather, they are developed based on substantial evidence gathered through observation, experimentation, and analysis.

Theories are formed after rigorous testing and refinement, and they integrate a large body of evidence, which allows them to explain and predict phenomena within their scope effectively. They are open to revision and falsification, meaning that new evidence can lead to changes in the theory. This adaptability is a crucial aspect of the scientific method, as it ensures that scientific understanding evolves as new information becomes available.

In contrast to the other options, which misunderstand the nature of scientific theories, this answer encapsulates their significance in the scientific community as a foundational aspect of how we understand and interpret the natural world.