Final answer:
The Big Bang Theory is the leading scientific explanation of the development of the universe over time because its results have been verified and accepted by scientists worldwide. (Option D)
Step-by-step explanation:
The Big Bang Theory is the leading scientific explanation of the development of the universe over time because its results have been repeated, verified, and accepted by scientists worldwide. The theory is supported by ample evidence, such as the observed expansion of the universe, the spectrum of cosmic microwave radiation, and the direct observations of the early stages of the universe. These pieces of evidence provide compelling support for the idea that the universe originated in a gigantic explosion, known as the Big Bang.