12. Which of the following is the best description of the Big Bang Theory? a The Big Bang Theory is the prevailing model about the universe's origin and is supported by observations of the universe's expansion b. The Big Bang Theory is just one of the ideas about the universe's origin, many of which are equally respected by the scientific community. c The Big Bang Theory states that pre-existing matter was compacted into a hot and dense form and suddenly exploded into infinite, empty space. d The Big Bang Theory is the scientific explanation of how the Sun, Earth and the rest of the Solar System were formed at the beginning of time. ​